Polygon is one of these names that Clash with some system objects
A similar work has been done earlier with PolyPolygon.

Change-Id: Icf2217cb2906292b7275760f1a16be0e150312f5
Reviewed-on: https://gerrit.libreoffice.org/17789Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Norbert Thiebaud <nthiebaud@gmail.com>