Fixes for VisualStudio6.0 build.
Fixes for VisualStudio6.0 build.


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