Add #ifndef's around the comparison operator's against const T* now that the implicit cast operator has been added.
Add #ifndef's around the comparison operator's against const T* now that the
implicit cast operator has been added.


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