Tests: Update sysconfig test to not depend on obsolete data files.

The pyconfig.h and makefile are no longer used. The correct way to
use sysconfig is through `sysconfig.get_config_vars()` which
is now tested instead of checking the files are present.

tests/functional/test_basic.py

@@ -332,9 +332,20 @@ def MyEXE(*args, **kwargs):
     _, err = capsys.readouterr()
     assert "'import warnings' failed" not in err
 
-@skipif_win
-def test_python_makefile(pyi_builder):
-    pyi_builder.test_script('pyi_python_makefile.py')
+
+@pytest.mark.parametrize("distutils", ["", "from distutils "])
+def test_python_makefile(pyi_builder, distutils):
+    """Tests hooks for ``sysconfig`` and its near-duplicate
+    ``distutils.sysconfig``. Should raise a distutils error if it needed the
+    ``pyconfig.h`` and ``makefile`` and didn't get them. Or an import error if
+    we failed to include the special extension module that replaced those
+    files in more modern Python versions.
+    """
+    pyi_builder.test_source("""
+    {}import sysconfig
+    from pprint import pprint
+    pprint(sysconfig.get_config_vars())
+    """.format(distutils))
 
 
 def test_set_icon(pyi_builder, data_dir):