Include libavcore/audioconvert.h, required for

av_get_channel_layout_string() in ff_dprintf_link.

Fix compilation.

Originally committed as revision 26380 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavfilter/avfilter.c

@@ -23,6 +23,7 @@
 
 #include "libavutil/pixdesc.h"
 #include "libavutil/rational.h"
+#include "libavcore/audioconvert.h"
 #include "libavcore/imgutils.h"
 #include "avfilter.h"
 #include "internal.h"