lavc: remove disabled FF_API_OLD_SAMPLE_FMT cruft.

libavcodec/utils.c

@@ -1658,12 +1658,6 @@ int av_get_bits_per_sample(enum CodecID codec_id){
     }
 }
 
-#if FF_API_OLD_SAMPLE_FMT
-int av_get_bits_per_sample_format(enum AVSampleFormat sample_fmt) {
-    return av_get_bytes_per_sample(sample_fmt) << 3;
-}
-#endif
-
 #if !HAVE_THREADS
 int ff_thread_init(AVCodecContext *s){
     return -1;