component/graphviz: add explicit rpath.

component/graphviz/buildout.cfg

@@ -61,4 +61,4 @@ environment =
   PATH=${pkgconfig:location}/bin:%(PATH)s
   PKG_CONFIG_PATH=${:pkg_config_depends}
   CPPFLAGS=-I${zlib:location}/include -I${libexpat:location}/include
-  LDFLAGS=-L${bzip2:location}/lib -Wl,-rpath=${bzip2:location}/lib -L${zlib:location}/lib -Wl,-rpath=${zlib:location}/lib -L${libexpat:location}/lib -Wl,-rpath=${libexpat:location}/lib -Wl,-rpath=${glib:location}/lib
+  LDFLAGS=-L${bzip2:location}/lib -Wl,-rpath=${bzip2:location}/lib -L${zlib:location}/lib -Wl,-rpath=${zlib:location}/lib -L${libexpat:location}/lib -Wl,-rpath=${libexpat:location}/lib -Wl,-rpath=${glib:location}/lib -Wl,-rpath=${pango:location}/lib