lavc: AV-prefix all codec capabilities

Express bitfields more simply.

Signed-off-by: Vittorio Giovara <vittorio.giovara@gmail.com>

libavcodec/opusdec.c

@@ -676,5 +676,5 @@ AVCodec ff_opus_decoder = {
     .close           = opus_decode_close,
     .decode          = opus_decode_packet,
     .flush           = opus_decode_flush,
-    .capabilities    = CODEC_CAP_DR1 | CODEC_CAP_DELAY,
+    .capabilities    = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_DELAY,
 };