[GLES2/iOS]: Fix bug 463 - Do not alter hierarchy when a external  ViewController is provided (this breaks push/pop ViewController)
[GLES2/iOS]: Fix bug 463 - Do not alter hierarchy when a external  ViewController is provided (this breaks push/pop ViewController)

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branch : v1-9

digimatic/ogre,digimatic/ogre,digimatic/ogre,digimatic/ogre,digimatic/ogre,digimatic/ogre,digimatic/ogre