From Paul Martz, build fix for Windows GL3 build
From Paul Martz, build fix for Windows GL3 build


XiaoCC/osg,XiaoCC/osg,ntoand/osg,omega-hub/osg,XiaoCC/osg,ghub/osg,XiaoCC/osg,koshman86/osg,ghub/osg,omega-hub/osg,artoolkit/osg,koshman86/osg,koshman86/osg,artoolkit/osg,omega-hub/osg,XiaoCC/osg,koshman86/osg,artoolkit/osg,artoolkit/osg,ghub/osg,omega-hub/osg,ghub/osg,ntoand/osg,ntoand/osg,ntoand/osg