Issue #27960: Revert state to 675e20c38fdac6, backing out all changes by…

Issue #27960: Revert state to 675e20c38fdac6, backing out all changes by developed for Issue #12885.

Lib/distutils/tests/test_filelist.py

@@ -7,7 +7,7 @@ from distutils.log import WARN
 from distutils.errors import DistutilsTemplateError
 from distutils.filelist import glob_to_re, translate_pattern, FileList
 
-from test.support import captured_stdout
+from test.support import captured_stdout, run_unittest
 from distutils.tests import support
 
 MANIFEST_IN = """\
@@ -292,5 +292,8 @@ class FileListTestCase(support.LoggingSilencer,
         self.assertWarnings()
 
 
+def test_suite():
+    return unittest.makeSuite(FileListTestCase)
+
 if __name__ == "__main__":
-    unittest.main()
+    run_unittest(test_suite())