the no cull flag into duplicated, inverted polygons. Remove support for the no cull flag from
the source. HOPEFULLY this does not introduce any visual defects. I did not see any. If you
see any, let me know. This is in preparation for improved object rendering.
git-svn-id: https://warzone2100.svn.sourceforge.net/svnroot/warzone2100/trunk@8471 4a71c877-e1ca-e34f-864e-861f7616d084