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

src/osgPlugins/gif/ReaderWriterGIF.cpp

@@ -561,7 +561,11 @@ GifImageStream** obj)
     *width_ret = giffile->SWidth;
     *height_ret = giffile->SHeight;
     *numComponents_ret = 4;
+#if (GIFLIB_MAJOR >= 5)
+    DGifCloseFile(giffile, &Error);
+#else
     DGifCloseFile(giffile);
+#endif
     return buffer;
 }