Fixed so the CG plugin will not register a factory when the GLES2 render system is the active render system.
Fixed so the CG plugin will not register a factory when the GLES2 render system is the active render system.

largerussiangames/ogre,jhu-lcsr-forks/ogre,vancepym/ogre,vancepym/ogre,jhu-lcsr-forks/ogre,nezticle/ogre,nezticle/ogre,nezticle/ogre,largerussiangames/ogre,largerussiangames/ogre,jhu-lcsr-forks/ogre,nezticle/ogre,vancepym/ogre,largerussiangames/ogre,vancepym/ogre,jhu-lcsr-forks/ogre,jhu-lcsr-forks/ogre,vancepym/ogre