contribs: updated binary package

This fixes VLC-Plugin issues within Safari and obviously includes the recent 3rd party library updates.

extras/contrib/Makefile

@@ -44,7 +44,7 @@ src: using-src
 
 ifdef HAVE_DARWIN_OS
 
-CONTRIBREV=12
+CONTRIBREV=13
 contrib-macosx-$(ARCH)-$(CONTRIBREV).tar.bz2:
 	$(WGET) http://downloads.videolan.org/pub/videolan/testing/contrib/$@