Fixed build for when OSG_USE_REF_PTR_IMPLICIT_OUTPUT_CONVERSION is off 
Fixed build for when OSG_USE_REF_PTR_IMPLICIT_OUTPUT_CONVERSION is off 


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