Fix for Win32 build.
Fix for Win32 build.


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