Various improvements

[kleisauke]

• Remove CPATH env in favor of CPPFLAGS.
• Remove redundant LIBRARY_PATH env.
• Remove redundant sed replacements and configure options.
• Enable Arm Neon support in libwebp, if available.
• Enable WebP support in libtiff (Enhancement: add support for WebP compression within TIFF output sharp#3198).

Consolidated linux-x64 build diff:

Details

--- a/various-improvements-linux-x64.out
+++ b/various-improvements-linux-x64.out
@@ -4059,10 +4059,7 @@ checking whether to build static libraries... yes
 Configuring for a minimal library
 So far so good!
 Checking zlib
-checking zlib.h usability... yes
-checking zlib.h presence... yes
-checking for zlib.h... yes
-checking for gzread in -lz... yes
+checking for Z... yes
 Checking lzma
 Disabling lzma compression support
 Checking headers
@@ -8138,17 +8135,13 @@ checking for lerc_decode in -l"Lerc"... no
 checking Lerc_c_api.h usability... no
 checking Lerc_c_api.h presence... no
 checking for Lerc_c_api.h... no
-checking for WebPDecode in -lwebp... no
+checking for WebPDecode in -lwebp... yes
 checking webp/decode.h usability... yes
 checking webp/decode.h presence... yes
 checking for webp/decode.h... yes
 checking for X... no
 checking for the pthreads library -lpthreads... no
-checking whether pthreads work without any flags... no
-checking whether pthreads work with -Kthread... no
-checking whether pthreads work with -kthread... no
-checking for the pthreads library -llthread... no
-checking whether pthreads work with -pthread... yes
+checking whether pthreads work without any flags... yes
 checking for joinable pthread attribute... PTHREAD_CREATE_JOINABLE
 checking if more special flags are required for pthreads... no
 checking whether we are using the Microsoft C compiler... no
@@ -8211,7 +8204,7 @@ Libtiff is now configured for x86_64-pc-linux-gnu
 
   Installation directory:             /target
   Documentation directory:            ${prefix}/share/doc/tiff-4.4.0
-  C compiler:                         gcc -march=westmere -Os -fPIC -D_GLIBCXX_USE_CXX11_ABI=1 -fno-asynchronous-unwind-tables -ffunction-sections -fdata-sections -Wall -W
+  C compiler:                         gcc -march=westmere -Os -fPIC -D_GLIBCXX_USE_CXX11_ABI=1 -fno-asynchronous-unwind-tables -ffunction-sections -fdata-sections -pthread -Wall -W
   C++ compiler:                       g++ -march=westmere -Os -fPIC -D_GLIBCXX_USE_CXX11_ABI=1 -fno-asynchronous-unwind-tables -ffunction-sections -fdata-sections
   Enable runtime linker paths:        no
   Enable linker symbol versioning:    no
@@ -8237,7 +8230,7 @@ Libtiff is now configured for x86_64-pc-linux-gnu
   LERC support:                       no
   LZMA2 support:                      no
   ZSTD support:                       no
-  WEBP support:                       no
+  WEBP support:                       yes
 
   C++ support:                        no
 
@@ -16423,60 +16368,60 @@ libm.so.6 does not exist in /target/lib
 libc.so.6 does not exist in /target/lib
 ld-linux-x86-64.so.2 does not exist in /target/lib
 libgcc_s.so.1 does not exist in /target/lib
-total 69252
-drwxr-xr-x 2 root root     4096 May 28 15:58 .
-drwxr-xr-x 7 root root     4096 May 28 15:58 ..
--rw-r--r-- 1 root root  6355878 May 28 15:49 libaom.a
--rw-r--r-- 1 root root    57894 May 28 15:53 libcairo-gobject.a
--rw-r--r-- 1 root root  1748028 May 28 15:53 libcairo.a
--rw-r--r-- 1 root root    15708 May 28 15:56 libcgif.a
--rw-r--r-- 1 root root   356106 May 28 15:47 libexif.a
--rw-r--r-- 1 root root   310408 May 28 15:51 libexpat.a
--rw-r--r-- 1 root root    84278 May 28 15:46 libffi.a
--rw-r--r-- 1 root root   553142 May 28 15:51 libfontconfig.a
--rw-r--r-- 1 root root  1089988 May 28 15:51 libfreetype.a
--rw-r--r-- 1 root root   150978 May 28 15:53 libfribidi.a
--rw-r--r-- 1 root root   361010 May 28 15:51 libgdk_pixbuf-2.0.a
--rw-r--r-- 1 root root  5553098 May 28 15:47 libgio-2.0.a
--rw-r--r-- 1 root root  2769508 May 28 15:46 libglib-2.0.a
--rw-r--r-- 1 root root    17740 May 28 15:46 libgmodule-2.0.a
--rw-r--r-- 1 root root   831922 May 28 15:46 libgobject-2.0.a
--rw-r--r-- 1 root root   685208 May 28 15:47 libgsf-1.a
--rw-r--r-- 1 root root     2846 May 28 15:46 libgthread-2.0.a
--rw-r--r-- 1 root root  2086714 May 28 15:52 libharfbuzz-subset.a
--rw-r--r-- 1 root root  2276974 May 28 15:52 libharfbuzz.a
--rw-r--r-- 1 root root  1905718 May 28 15:50 libheif.a
--rw-r--r-- 1 root root    83574 May 28 15:50 libimagequant.a
--rw-r--r-- 1 root root   869366 May 28 15:50 libjpeg.a
--rw-r--r-- 1 root root   975154 May 28 15:47 liblcms2.a
--rw-r--r-- 1 root root  1255920 May 28 15:51 liborc-0.4.a
--rw-r--r-- 1 root root   838738 May 28 15:53 libpango-1.0.a
--rw-r--r-- 1 root root   101924 May 28 15:53 libpangocairo-1.0.a
--rw-r--r-- 1 root root   185930 May 28 15:53 libpangoft2-1.0.a
--rw-r--r-- 1 root root   911992 May 28 15:53 libpixman-1.a
-lrwxrwxrwx 1 root root       10 May 28 15:50 libpng.a -> libpng16.a
--rw-r--r-- 1 root root   449666 May 28 15:50 libpng16.a
--rw-r--r-- 1 root root 10239968 May 28 15:56 librsvg-2.a
--rw-r--r-- 1 root root   105976 May 28 15:50 libspng.a
--rw-r--r-- 1 root root   762670 May 28 15:51 libtiff.a
-lrwxrwxrwx 1 root root       22 May 28 15:58 libvips-cpp.so -> libvips-cpp.so.42.14.2
-lrwxrwxrwx 1 root root       22 May 28 15:58 libvips-cpp.so.42 -> libvips-cpp.so.42.14.2
--rwxr-xr-x 1 root root 18821928 May 28 15:58 libvips-cpp.so.42.14.2
--rw-r--r-- 1 root root  6008736 May 28 15:58 libvips.a
--rw-r--r-- 1 root root   770968 May 28 15:50 libwebp.a
--rw-r--r-- 1 root root    17658 May 28 15:50 libwebpdemux.a
--rw-r--r-- 1 root root    55024 May 28 15:50 libwebpmux.a
--rw-r--r-- 1 root root   957014 May 28 15:47 libxml2.a
--rw-r--r-- 1 root root   200682 May 28 15:45 libz.a
--rw-r--r-- 1 root root      221 May 28 15:47 xml2Conf.sh
-     9085892     8759310  96% /packaging/libvips-8.12.2-linux-x64.tar.gz
-     9085892     8759310  96%
+total 69312
+drwxr-xr-x 2 root root     4096 May 28 18:34 .
+drwxr-xr-x 7 root root     4096 May 28 18:34 ..
+-rw-r--r-- 1 root root  6355878 May 28 18:25 libaom.a
+-rw-r--r-- 1 root root    57894 May 28 18:29 libcairo-gobject.a
+-rw-r--r-- 1 root root  1748028 May 28 18:29 libcairo.a
+-rw-r--r-- 1 root root    15708 May 28 18:32 libcgif.a
+-rw-r--r-- 1 root root   356106 May 28 18:23 libexif.a
+-rw-r--r-- 1 root root   310408 May 28 18:27 libexpat.a
+-rw-r--r-- 1 root root    84278 May 28 18:21 libffi.a
+-rw-r--r-- 1 root root   553142 May 28 18:27 libfontconfig.a
+-rw-r--r-- 1 root root  1089988 May 28 18:27 libfreetype.a
+-rw-r--r-- 1 root root   150978 May 28 18:29 libfribidi.a
+-rw-r--r-- 1 root root   361010 May 28 18:27 libgdk_pixbuf-2.0.a
+-rw-r--r-- 1 root root  5553098 May 28 18:22 libgio-2.0.a
+-rw-r--r-- 1 root root  2769508 May 28 18:21 libglib-2.0.a
+-rw-r--r-- 1 root root    17740 May 28 18:21 libgmodule-2.0.a
+-rw-r--r-- 1 root root   831922 May 28 18:22 libgobject-2.0.a
+-rw-r--r-- 1 root root   685208 May 28 18:23 libgsf-1.a
+-rw-r--r-- 1 root root     2846 May 28 18:21 libgthread-2.0.a
+-rw-r--r-- 1 root root  2086714 May 28 18:28 libharfbuzz-subset.a
+-rw-r--r-- 1 root root  2276974 May 28 18:28 libharfbuzz.a
+-rw-r--r-- 1 root root  1905718 May 28 18:26 libheif.a
+-rw-r--r-- 1 root root    83574 May 28 18:26 libimagequant.a
+-rw-r--r-- 1 root root   869366 May 28 18:26 libjpeg.a
+-rw-r--r-- 1 root root   975154 May 28 18:23 liblcms2.a
+-rw-r--r-- 1 root root  1255920 May 28 18:27 liborc-0.4.a
+-rw-r--r-- 1 root root   838738 May 28 18:29 libpango-1.0.a
+-rw-r--r-- 1 root root   101924 May 28 18:29 libpangocairo-1.0.a
+-rw-r--r-- 1 root root   185930 May 28 18:29 libpangoft2-1.0.a
+-rw-r--r-- 1 root root   911992 May 28 18:29 libpixman-1.a
+lrwxrwxrwx 1 root root       10 May 28 18:26 libpng.a -> libpng16.a
+-rw-r--r-- 1 root root   449666 May 28 18:26 libpng16.a
+-rw-r--r-- 1 root root 10239968 May 28 18:32 librsvg-2.a
+-rw-r--r-- 1 root root   105976 May 28 18:26 libspng.a
+-rw-r--r-- 1 root root   782006 May 28 18:27 libtiff.a
+lrwxrwxrwx 1 root root       22 May 28 18:34 libvips-cpp.so -> libvips-cpp.so.42.14.2
+lrwxrwxrwx 1 root root       22 May 28 18:34 libvips-cpp.so.42 -> libvips-cpp.so.42.14.2
+-rwxr-xr-x 1 root root 18866984 May 28 18:34 libvips-cpp.so.42.14.2
+-rw-r--r-- 1 root root  6008736 May 28 18:34 libvips.a
+-rw-r--r-- 1 root root   770968 May 28 18:26 libwebp.a
+-rw-r--r-- 1 root root    17658 May 28 18:26 libwebpdemux.a
+-rw-r--r-- 1 root root    55024 May 28 18:26 libwebpmux.a
+-rw-r--r-- 1 root root   957014 May 28 18:22 libxml2.a
+-rw-r--r-- 1 root root   200682 May 28 18:21 libz.a
+-rw-r--r-- 1 root root      223 May 28 18:22 xml2Conf.sh
+     9098440     8774865  96% /packaging/libvips-8.12.2-linux-x64.tar.gz
+     9098440     8774865  96%
 ##[group]Run ./integrity.sh
 �[36;1m./integrity.sh�[0m
 shell: /usr/bin/bash -e {0}
 ##[endgroup]
-sha512-SEFgYixn2dW/ZqCppDwMnQAL9sXizzFSvwLdnc96QILiJCFdPRJ6RHJcWT8XDndDa849zAFLZW2qNQ8opNplGw== libvips-8.12.2-linux-x64.tar.br
-sha512-RDokHL/3pD/xIkf9Yp4wuC0m9yQ9hOhsoPbeSNXQCVS9l/COJ5hJHnem0nZjDesiG7GZNCDIlffzFx+4/gDDGg== libvips-8.12.2-linux-x64.tar.gz
+sha512-B4OUhTaxxBaNftuevFZ4p4g0ltbadQ7h4hSwq5Py/XGw3Qa03C+TwJ78Wj2i5z9EqlKd1VSvLGBdie1gvzzeOA== libvips-8.12.2-linux-x64.tar.br
+sha512-IWuODV3bVi50FgkWhAdDjgBFaxQVqav2tBv5QaEhHgr5Jdk3P4bwNCGIPFUq0RvQVDuQ0jO50Ozs5hZ7usYD+Q== libvips-8.12.2-linux-x64.tar.gz
 Post job cleanup.
 [command]/usr/bin/git version
 git version 2.36.1

Might depend on PR: google/oss-fuzz#7775.

[lovell]

Dankjewel Kleis!