python: suppress warnings from PEP 706 (trivial)

Suppress warnings raised from python 3.12 and later by PEP 706 – Filter for tarfile.extractall.

In Python 3.12, a DeprecationWarning about tarfile filtering by default in Python 3.14

    DeprecationWarning: Python 3.14 will, by default, filter extracted
    tar archives and reject files or modify their metadata.
    Use the filter argument to control this behavior.

To enable this for simple cases, the built-in filters will have string
names; e.g. users can pass filter='data' instead of a specific function
that deals with TarInfo objects.

Read more: https://peps.python.org/pep-0706/

scripts/download-clang-prebuilt-binaries.py

@@ -37,7 +37,10 @@ def download_url(url, tarball):
 def extract_tarfile(tar):
   print('Extracting %s' % tar)
   with tarfile.open(tar) as package_tar:
-    package_tar.extractall()
+    if sys.version_info >= (3, 12):
+      package_tar.extractall(filter='tar')
+    else:
+      package_tar.extractall()
 
 def mkdir_p(path):
   try:

scripts/install-sysroot-freebsd.py

@@ -71,7 +71,10 @@ def extract_tarfile(tar, sysroot=".", filters=[]):
         filtered_members.append(member)
     if not filtered_members:
       return
-    package_tar.extractall(sysroot, filtered_members)
+    if sys.version_info >= (3, 12):
+      package_tar.extractall(sysroot, filtered_members, filter='tar')
+    else:
+      package_tar.extractall(sysroot, filtered_members)
 
 
 def GetSha256(filename):

scripts/install-sysroot.py

@@ -59,7 +59,10 @@ def GetSha1(filename):
 def extract_tarfile(tar, sysroot):
   print('Extracting %s' % tar)
   with tarfile.open(tar) as package_tar:
-    package_tar.extractall(sysroot)
+    if sys.version_info >= (3, 12):
+      package_tar.extractall(sysroot, filter='tar')
+    else:
+      package_tar.extractall(sysroot)
 def main(args):
   parser = optparse.OptionParser('usage: %prog [OPTIONS]', description=__doc__)
   parser.add_option('--arch',