Added SG_EXPORT which was missing.
Added SG_EXPORT which was missing.


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