lavc/old_codec_ids: Fix make checkheaders.

libavcodec/old_codec_ids.h

@@ -20,6 +20,7 @@
 #define AVCODEC_OLD_CODEC_IDS_H
 
 #include "libavutil/attributes.h"
+#include "libavutil/common.h"
 
 /*
  * This header exists to prevent new codec IDs from being accidentally added to