GLES2: Add a runtime check for occlusion query support
GLES2: Add a runtime check for occlusion query support

OGRECave/ogre,OGRECave/ogre,paroj/ogre,OGRECave/ogre,paroj/ogre,RealityFactory/ogre,OGRECave/ogre,OGRECave/ogre,RealityFactory/ogre,RealityFactory/ogre,paroj/ogre,paroj/ogre,RealityFactory/ogre,RealityFactory/ogre,paroj/ogre