build: Replace Python distutils by sysconfig

This module has been deprecated in Python >= 3.10
(https://peps.python.org/pep-0632/).  Replace distutils.sysconfig with
sysconfig which is not quite a drop-in replacement.

This fix is incomplete as we still reference distutils in
python/setup.py.in.  However that is only used for PIP-style
distributions (make -C python sdist) which we don't really use or
recommend.

Thanks: Miro Hrončok
See-also: https://peps.python.org/pep-0632/
See-also: https://lists.fedoraproject.org/archives/list/python-devel@lists.fedoraproject.org/thread/N6ITYHLRWIDNYNXGPYG2ZHF3ZLQWZN7L/

Cherry picked from libguestfs commit 26940f64a7406761

configure.ac

@@ -271,10 +271,10 @@ AS_IF([test "x$enable_python" != "xno"],
 
             AC_MSG_CHECKING([for Python include path])
             if test -z "$PYTHON_CFLAGS"; then
-                python_path=`$PYTHON -c "import distutils.sysconfig; \
-                                         print (distutils.sysconfig.get_python_inc ());"`
-                python_platpath=`$PYTHON -c "import distutils.sysconfig; \
-                                             print (distutils.sysconfig.get_python_inc (plat_specific=1));"`
+                python_path=`$PYTHON -c "import sysconfig; \
+                                         print (sysconfig.get_path('include'));"`
+                python_platpath=`$PYTHON -c "import sysconfig; \
+                                             print (sysconfig.get_path('platinclude'));"`
                 if test "$python_path" = "$python_platpath"; then
                     PYTHON_CFLAGS=-I$python_path
                 else
@@ -294,16 +294,16 @@ AS_IF([test "x$enable_python" != "xno"],
 	        PYTHON_INSTALLDIR=
                 AC_MSG_CHECKING([for Python site-packages path])
                 if test -z "$PYTHON_INSTALLDIR"; then
-                    PYTHON_INSTALLDIR=`$PYTHON -c "import distutils.sysconfig; \
-                                                   print (distutils.sysconfig.get_python_lib(1,0));"`
+                    PYTHON_INSTALLDIR=`$PYTHON -c "import sysconfig; \
+                                                   print (sysconfig.get_path('platlib'));"`
                 fi
                 AC_MSG_RESULT([$PYTHON_INSTALLDIR])
             fi
 
             AC_MSG_CHECKING([for Python extension suffix (PEP-3149)])
             if test -z "$PYTHON_EXT_SUFFIX"; then
-                python_ext_suffix=`$PYTHON -c "import distutils.sysconfig; \
-                                               print (distutils.sysconfig.get_config_var('EXT_SUFFIX') or distutils.sysconfig.get_config_var('SO'))"`
+                python_ext_suffix=`$PYTHON -c "import sysconfig; \
+                                             print (sysconfig.get_config_var('EXT_SUFFIX') or sysconfig.get_config_var('SO'))"`
                 PYTHON_EXT_SUFFIX=$python_ext_suffix
             fi
             AC_MSG_RESULT([$PYTHON_EXT_SUFFIX])