added check for icon existance in bool GLXGLSupport (transplanted from 749f2077cec036037e11464cc967572ba5e63056)
added check for icon existance in bool GLXGLSupport
(transplanted from 749f2077cec036037e11464cc967572ba5e63056)

--HG--
branch : v1-8
extra : transplant_source : t%9F%20w%CE%C06%03%7E%11FL%C9gW%2B%A5%E60V

vancepym/ogre,jhu-lcsr-forks/ogre,nezticle/ogre,nezticle/ogre,largerussiangames/ogre,jhu-lcsr-forks/ogre,jhu-lcsr-forks/ogre,vancepym/ogre,vancepym/ogre,jhu-lcsr-forks/ogre,vancepym/ogre,largerussiangames/ogre,vancepym/ogre,nezticle/ogre,largerussiangames/ogre,largerussiangames/ogre,jhu-lcsr-forks/ogre,nezticle/ogre