Removed all the plugins BUILD_OSG_* options as these just get in the way of  browsing standard CMake options.
Removed all the plugins BUILD_OSG_* options as these just get in the way of 
browsing standard CMake options.


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