python: mention that SETUPTOOLS_USE_DISTUTILS=stdlib will error with 3.12

The news wrongly stated that it has no effect, but setuptools just fails without
any explanation starting with 3.12 as it will still try to import distutils from
the stdlib.

Author: lazka

web/docs/python.md

@@ -31,5 +31,6 @@ if os.name == "nt" and sysconfig.get_platform().startswith("mingw"):
 
 ### Changelog
 
+* 2024-11-09: With the update to Python 3.12, the environment variable setting `SETUPTOOLS_USE_DISTUTILS=stdlib` will cause distutils import errors because the standard library's distutils module has been removed. If you're still using this workaround, remove the environment variable.
 * 2024-07-01: [setuptools](https://github.com/pypa/setuptools) now supports building C extensions in MSYS2 since [v70.2.0](https://github.com/pypa/setuptools/releases/tag/v70.2.0). Previous versions required `export SETUPTOOLS_USE_DISTUTILS=stdlib` as a workaround.
 * 2023-08-22: The mingw Python now provides the limited ABI DLL (libpython3.dll). Support in upstream setuptools is still missing though.

web/news.md

@@ -31,8 +31,9 @@ There are some minor things to watch out for with this update:
 * While not MSYS2 specific, 3.12 is the version that [dropped the included
   distutils package](https://peps.python.org/pep-0632) and distutils is now only
   available as part of setuptools. While the current setuptools should handle
-  our Python out of the box, there may be slight differences. This also means
-  that SETUPTOOLS_USE_DISTUTILS=stdlib no longer has any effect.
+  our Python out of the box, there may be slight differences. Make sure to
+  remove anything setting `SETUPTOOLS_USE_DISTUTILS=stdlib` as that will lead to
+  distutils import errors.
 * As with every major Python update we had to drop a few packages that were
   incompatible with the new version and for which no update or patch was
   available. One notable package there is py2exe which does not support 3.12+