Add comment to Distutil files about requiring 1.5.2 compatibility, as
    suggested by PEP 291.
diff --git a/Lib/distutils/ccompiler.py b/Lib/distutils/ccompiler.py
index 3084947..edb9f75 100644
--- a/Lib/distutils/ccompiler.py
+++ b/Lib/distutils/ccompiler.py
@@ -3,6 +3,8 @@
 Contains CCompiler, an abstract base class that defines the interface
 for the Distutils compiler abstraction model."""
 
+# This module should be kept compatible with Python 1.5.2.
+
 __revision__ = "$Id$"
 
 import sys, os, re