Removed OSX override override of PLUGIN_DIRS.
Removed OSX override override of PLUGIN_DIRS.


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