Added CoreProfile selection if OSG_GL3_AVAILABLE defined
Added CoreProfile selection if OSG_GL3_AVAILABLE defined

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