Removed the repeated entry of HiehgtFieldNode in include list
Removed the repeated entry of HiehgtFieldNode in include list


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