Removes 220 warnings from build log (at least under Windows).
Requires Python 2.5+

Change-Id: I06b18b14a08f2c27528fcb009faddff081ffd54e
Reviewed-on: https://gerrit.libreoffice.org/29172Reviewed-by: Michael Stahl <mstahl@redhat.com>
Tested-by: Mike Kaganski <mike.kaganski@collabora.com>