Add comment to Distutil files about requiring 1.5.2 compatibility, as
    suggested by PEP 291.
diff --git a/Lib/distutils/command/config.py b/Lib/distutils/command/config.py
index abfa138..b6f5ad1 100644
--- a/Lib/distutils/command/config.py
+++ b/Lib/distutils/command/config.py
@@ -9,6 +9,8 @@
 this header file lives".
 """
 
+# This module should be kept compatible with Python 1.5.2.
+
 __revision__ = "$Id$"
 
 import sys, os, string, re