GLES2: Resolve some GL errors by excluding cube maps from getting auto generated mipmaps
GLES2: Resolve some GL errors by excluding cube maps from getting auto generated mipmaps

--HG--
branch : v1-8

ruleless/ogre,ruleless/ogre,ehsan/ogre,ehsan/ogre,bhlzlx/ogre,ruleless/ogre,bhlzlx/ogre,ehsan/ogre,bhlzlx/ogre,ruleless/ogre,bhlzlx/ogre,bhlzlx/ogre,ehsan/ogre,bhlzlx/ogre,ruleless/ogre,ehsan/ogre,ruleless/ogre