pure/osutil: add copyright and license header

mercurial/pure/osutil.py

@@ -1,3 +1,10 b''
+# osutil.py - pure Python version of osutil.c
+#
+#  Copyright 2009 Matt Mackall <[e-mail]> and others
+#
+# This software may be used and distributed according to the terms of the
+# GNU General Public License version 2, incorporated herein by reference.
+
 import os
 import stat as _stat