Improved GLSL geometry shader handling.
Improved GLSL geometry shader handling.

--HG--
branch : v1-6
extra : convert_revision : svn%3A8631bf8a-c64b-0410-883c-f3eb003322f7/branches/v1-6%40177

ruleless/ogre,largerussiangames/ogre,largerussiangames/ogre,ehsan/ogre,bhlzlx/ogre,nezticle/ogre,ehsan/ogre,ruleless/ogre,vancepym/ogre,bhlzlx/ogre,jhu-lcsr-forks/ogre,vancepym/ogre,nezticle/ogre,jhu-lcsr-forks/ogre,ehsan/ogre,vancepym/ogre,ruleless/ogre,bhlzlx/ogre,bhlzlx/ogre,ehsan/ogre,ehsan/ogre,jhu-lcsr-forks/ogre,vancepym/ogre,largerussiangames/ogre,ruleless/ogre,jhu-lcsr-forks/ogre,ruleless/ogre,nezticle/ogre,largerussiangames/ogre,nezticle/ogre,bhlzlx/ogre,jhu-lcsr-forks/ogre,vancepym/ogre,ruleless/ogre,bhlzlx/ogre