Fix for VS6.0 build
Fix for VS6.0 build


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