Add comment to Distutil files about requiring 1.5.2 compatibility, as

suggested by PEP 291.

Lib/distutils/command/install_headers.py

@@ -3,6 +3,8 @@
 Implements the Distutils 'install_headers' command, to install C/C++ header
 files to the Python include directory."""
 
+# This module should be kept compatible with Python 1.5.2.
+
 __revision__ = "$Id$"
 
 import os