[3.13] Revert "[3.13] gh-132921: Fix setuptools._distutils.dep_util deprecation (GH-132923) (#132926)"

[vstinner]

This reverts commit 3776ade.

setuptools.modified module is not available on old setuptools versions.

• Issue: test_peg_generator fails when using -Werror: dep_util is Deprecated #132921

[vstinner]

Python 3.13 uses setuptools-67.6.1 which doesn't have setuptools.modified module yet :-(

[kulikjak]

Hi @vstinner, do you plan to backport this change in a different way? Because while setuptools.modified is not available in setuptools delivered with Python 3.13, the deprecation warning reappears when newer setuptools is available :(.

Internally, I went with the following; it should work with both old and new:

--- Python-3.13.3/Tools/peg_generator/pegen/build.py
+++ Python-3.13.3/Tools/peg_generator/pegen/build.py
@@ -95,7 +95,10 @@ def compile_c_extension(
     import setuptools.logging
 
     from setuptools import Extension, Distribution
-    from setuptools._distutils.dep_util import newer_group
+    try:
+        from setuptools.modified import newer_group
+    except ImportError:
+        from setuptools._distutils.dep_util import newer_group
     from setuptools._distutils.ccompiler import new_compiler
     from setuptools._distutils.sysconfig import customize_compiler

[vstinner]

@kulikjak: I created a PR from your comment: #133522