contrib: ffmpeg: fix OSX linking with vda enabled

patch sent to libav

contrib/src/ffmpeg/rules.mak

@@ -116,6 +116,7 @@ ffmpeg: ffmpeg-$(FFMPEG_VERSION).tar.gz .sum-ffmpeg
 ifdef HAVE_WIN32
 	sed -i "s/std=c99/std=gnu99/" $@-$(FFMPEG_VERSION)/configure
 endif
+	$(APPLY) $(SRC)/ffmpeg/vda.patch
 	$(MOVE)
 
 .ffmpeg: ffmpeg

contrib/src/ffmpeg/vda.patch

+--- ffmpeg-git/configure.orig	2011-11-24 19:07:09.080887690 -0500
++++ ffmpeg-git/configure	2011-11-24 19:07:36.597024164 -0500
+@@ -3000,6 +3000,7 @@
+     if check_header VideoDecodeAcceleration/VDADecoder.h; then
+         enable vda
+         add_ldflags -framework CoreFoundation -framework VideoDecodeAcceleration -framework QuartzCore
++        add_extralibs -framework CoreFoundation -framework VideoDecodeAcceleration -framework QuartzCore
+     fi
+ fi
+