From Clement Boesch, "Fix remaining bit of Giflib5 usage"


git-svn-id: http://svn.openscenegraph.org/osg/OpenSceneGraph/branches/OpenSceneGraph-3.2@14487 16af8721-9629-0410-8352-f15c8da7e697
Fixed contributors names


git-svn-id: http://svn.openscenegraph.org/osg/OpenSceneGraph/branches/OpenSceneGraph-3.2@14488 16af8721-9629-0410-8352-f15c8da7e697