inih: update to 57.

MSVC throws C4244 by @AbsintheScripting in #142
Added a GetUnsigned function for getting unsigned values. by @jcormier in #147
meson.build: fix start-of-line_comment_prefix variable name by @ihilt in #149
Added GetInteger64 and GetUnsigned64 to read 64-bit integers by @natcat256 in #151
Fix redundant cast-to-int when INI_USE_STACK!=0
Make inline comments work on subsequent lines of multiline values
Added "version" to meson.build config: #135 (but bumped up to 55 in a subsequent commit, for this release).
Mainly #134, adding the visibility symbols to the Meson build config, but also other small tweaks to tests and so on.

textproc/inih/Makefile

@@ -1,8 +1,7 @@
-# $NetBSD: Makefile,v 1.3 2023/08/14 05:25:22 wiz Exp $
+# $NetBSD: Makefile,v 1.4 2023/08/24 09:09:56 wiz Exp $
 
-DISTNAME=	inih-r53
+DISTNAME=	inih-r57
 PKGNAME=	${DISTNAME:S/-r/-/1}
-PKGREVISION=	1
 CATEGORIES=	textproc
 MASTER_SITES=	${MASTER_SITE_GITHUB:=benhoyt/}
 GITHUB_PROJECT=	inih

textproc/inih/distinfo

@@ -1,5 +1,5 @@
-$NetBSD: distinfo,v 1.4 2021/10/26 11:22:09 nia Exp $
+$NetBSD: distinfo,v 1.5 2023/08/24 09:09:56 wiz Exp $
 
-BLAKE2s (inih-r53.tar.gz) = c33e1f871c4eed71a920354fd873c715f70245e794836670a18ba26167c27212
-SHA512 (inih-r53.tar.gz) = 99bc40c294b521e9973184bfb30d60c129735991f33b387b3d023827a34672b0489eadf91e38895ea725168dbc7b27bb02c1975debe7573b4b209d0e947b2100
-Size (inih-r53.tar.gz) = 16984 bytes
+BLAKE2s (inih-r57.tar.gz) = 141de82a0b35b9c14687a923ee3e579c8c922f6fcd514bc6dfeda24e0d5b17c5
+SHA512 (inih-r57.tar.gz) = 9f758df876df54ed7e228fd82044f184eefbe47e806cd1e6d62e1b0ea28e2c08e67fa743042d73b4baef0b882480e6afe2e72878b175822eb2bdbb6d89c0e411
+Size (inih-r57.tar.gz) = 18954 bytes