From Claus Steuer, "XCode 6, IOs 8.1 SDK Compile fix : There are some undefined texture formats when compiling osg for IOs 8.1 with XCode 6 and OpenGLES2 enabled."


git-svn-id: http://svn.openscenegraph.org/osg/OpenSceneGraph/branches/OpenSceneGraph-3.2@14509 16af8721-9629-0410-8352-f15c8da7e697