Further clarify licensing status of compat/subprocess.py.

PSF license explicitly states the files in Python distribution is
compatible with GPL, and upstream clarified the licensing terms by
shortening its file header.  This version is a verbatim copy from
release24-maint branch form Python CVS.

Signed-off-by: Junio C Hamano <junkio@cox.net>

compat/subprocess.py

@@ -2,28 +2,12 @@
 #
 # For more information about this module, see PEP 324.
 #
-# Copyright (c) 2003-2004 by Peter Astrand <astrand@lysator.liu.se>
+# This module should remain compatible with Python 2.2, see PEP 291.
 #
-# By obtaining, using, and/or copying this software and/or its
-# associated documentation, you agree that you have read, understood,
-# and will comply with the following terms and conditions:
+# Copyright (c) 2003-2005 by Peter Astrand <astrand@lysator.liu.se>
 #
-# Permission to use, copy, modify, and distribute this software and
-# its associated documentation for any purpose and without fee is
-# hereby granted, provided that the above copyright notice appears in
-# all copies, and that both that copyright notice and this permission
-# notice appear in supporting documentation, and that the name of the
-# author not be used in advertising or publicity pertaining to
-# distribution of the software without specific, written prior
-# permission.
-#
-# THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
-# INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS.
-# IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, INDIRECT OR
-# CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
-# OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
-# NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
-# WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+# Licensed to PSF under a Contributor Agreement.
+# See http://www.python.org/2.4/license for licensing details.
 
 r"""subprocess - Subprocesses with accessible I/O streams