From Marco Jez, typo fix if GL extension name.
From Marco Jez, typo fix if GL extension name.


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