Add comment to Distutil files about requiring 1.5.2 compatibility, as

suggested by PEP 291.

Lib/distutils/dep_util.py

@@ -4,6 +4,8 @@ Utility functions for simple, timestamp-based dependency of files
 and groups of files; also, function based entirely on such
 timestamp dependency analysis."""
 
+# This module should be kept compatible with Python 1.5.2.
+
 __revision__ = "$Id$"
 
 import os