TT#91151 ignore Opus format for comparison purposes

This is a stub until a proper format comparison can be added, for at
least Opus and AMR

Change-Id: Ib25f79b492f227c78dd59a4d00220d17b15a40c7

lib/codeclib.c

@@ -354,6 +354,7 @@ static codec_def_t __codec_defs[] = {
 		.media_type = MT_AUDIO,
 		.codec_type = &codec_type_avcodec,
 		.init = opus_init,
+		.format_cmp = format_cmp_ignore,
 		.set_enc_options = opus_set_enc_options,
 		.dtx_methods = {
 			[DTX_SILENCE] = &dtx_method_silence,