iOS: Reinstate the accidentally deleted OS check for multisampling and framebuffer discard for GLES 2
iOS: Reinstate the accidentally deleted OS check for multisampling and framebuffer discard for GLES 2

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