Fixed compile problems under VisualStudio w.r.t  the new additions for precompiled mipmaps.  Changed std::size_t to unsigned int.
Fixed compile problems under VisualStudio w.r.t  the new additions for
precompiled mipmaps.  Changed std::size_t to unsigned int.


git-svn-id: 23b6355f2bb369032457de4eb5f713ee134f73a8@624 16af8721-9629-0410-8352-f15c8da7e697

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