iOS: Enable building the GLES 2 rendersystem and change some comments to reference iOS
iOS: Enable building the GLES 2 rendersystem and change some comments to reference iOS

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