Include avc.h from avc.c: It contains several prototypes.

Originally committed as revision 22098 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavformat/avc.c

@@ -22,6 +22,7 @@
 #include "libavutil/intreadwrite.h"
 #include "avformat.h"
 #include "avio.h"
+#include "avc.h"
 
 static const uint8_t *ff_avc_find_startcode_internal(const uint8_t *p, const uint8_t *end)
 {