contrib: use a newer ffmpeg

This should fix WMA decoding, lets hope not too many ffmpeg bugs are present in this revision. :/

extras/contrib/src/Makefile

@@ -1067,7 +1067,7 @@ DISTCLEAN_PKG += amrwb-$(LIBAMR_WB_VERSION).tar.bz2
 
 ifdef SVN
 ffmpeg:
-	$(SVN) co $(FFMPEG_SVN) ffmpeg -r 14661
+	$(SVN) co $(FFMPEG_SVN) ffmpeg -r 15261
 ifeq ($(HOST),i586-pc-beos)
 	(cd $@; patch -p0 < ../Patches/ffmpeg-svn-beos.patch)
 endif