Fixed build aginst GLES1 and GLES2
Fixed build aginst GLES1 and GLES2


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