From Stephan Huber, compile fix for OpenGL ES on iOS.
From Stephan Huber, compile fix for OpenGL ES on iOS.


artoolkit/osg,jtorresfabra/osg,openscenegraph/osg,jtorresfabra/osg,scrawl/osg,artoolkit/osg,openscenegraph/osg,scrawl/osg,artoolkit/osg,scrawl/osg,artoolkit/osg,tomasthoresen/osg,jtorresfabra/osg,openscenegraph/osg,marchelbling/osg,marchelbling/osg,marchelbling/osg,tomasthoresen/osg,tomasthoresen/osg,openscenegraph/osg,jtorresfabra/osg,marchelbling/osg,scrawl/osg,tomasthoresen/osg