Add comment to Distutil files about requiring 1.5.2 compatibility, as
    suggested by PEP 291.
diff --git a/Lib/distutils/archive_util.py b/Lib/distutils/archive_util.py
index 98c1e55..d1dc909 100644
--- a/Lib/distutils/archive_util.py
+++ b/Lib/distutils/archive_util.py
@@ -3,6 +3,8 @@
 Utility functions for creating archive files (tarballs, zip files,
 that sort of thing)."""
 
+# This module should be kept compatible with Python 1.5.2.
+
 __revision__ = "$Id$"
 
 import os