lavc/hevc: mark decoder as experimental

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/hevc.c

@@ -3114,5 +3114,5 @@ AVCodec ff_hevc_decoder = {
     .flush                 = hevc_decode_flush,
     .update_thread_context = hevc_update_thread_context,
     .init_thread_copy      = hevc_init_thread_copy,
-    .capabilities   = CODEC_CAP_DR1 | CODEC_CAP_DELAY | CODEC_CAP_FRAME_THREADS,
+    .capabilities   = CODEC_CAP_DR1 | CODEC_CAP_DELAY | CODEC_CAP_FRAME_THREADS | CODEC_CAP_EXPERIMENTAL,
 };