From Stephane Simon, compile fix for VS, change struct to class in forward declaration.
From Stephane Simon, compile fix for VS, change struct to class in forward declaration.


git-svn-id: 23b6355f2bb369032457de4eb5f713ee134f73a8@3657 16af8721-9629-0410-8352-f15c8da7e697

joevandyk/osg,joevandyk/osg,joevandyk/osg,joevandyk/osg,joevandyk/osg