'SONC' codec is not even mentioned in libavcodec anymore

(cherry picked from commit 3cb55949)
Signed-off-by: Rafaël Carré <funman@videolan.org>

modules/codec/avcodec/fourcc.c

@@ -358,7 +358,9 @@ static const struct
 
     { VLC_CODEC_ATRAC3, CODEC_ID_ATRAC3, AUDIO_ES },
 
+#if LIBAVCODEC_VERSION_MAJOR < 54
     { VLC_CODEC_SONIC, CODEC_ID_SONIC, AUDIO_ES },
+#endif
 
     { VLC_CODEC_IMC, CODEC_ID_IMC, AUDIO_ES },