Don't search for multiple Pythons as it doesn't interact well with our
distutils-r1 setup. Just search for one Python and allow overriding which
one from the ebuild.
--- a/configure.ac
+++ b/configure.ac
@@ -287,23 +287,8 @@ else
     # Only look for Python versions explicitly that are not yet end-of-life.
     # As fallback look for any Python version >= 3.6.
     m4_foreach([mym4pythonver],
-               [[3.9],[3.10],[3.11],[3.12],[3.13],[any]],
-        [unset PYTHON
-        unset PYTHON_VERSION
-        unset PYTHON_CPPFLAGS
-        unset PYTHON_LDFLAGS
-        unset PYTHON_LIBS
-        unset PYTHON_SITE_PKG
-        unset PYTHON_PLATFORM_SITE_PKG
-        unset PYTHON_EXTRA_LIBS
-        unset PYTHON_EXTRA_LDFLAGS
-        unset ac_cv_path_PYTHON
-        unset am_cv_pathless_PYTHON
-        unset am_cv_python_version
-        unset am_cv_python_platform
-        unset am_cv_python_pythondir
-        unset am_cv_python_pyexecdir
-        AM_PATH_PYTHON(m4_if(mym4pythonver,[any],[3.6],mym4pythonver), [
+               [[any]],
+        [AM_PATH_PYTHON(m4_if(mym4pythonver,[any],[3.6],mym4pythonver), [
             AX_PYTHON_DEVEL([], [true])
             if test "$PYTHON_VERSION"; then
                 AC_MSG_CHECKING([for the setuptools Python package])