bmv: add CODEC_CAP_DR1

Signed-off-by: Paul B Mahol <onemda@gmail.com>

libavcodec/bmv.c

@@ -369,6 +369,7 @@ AVCodec ff_bmv_video_decoder = {
     .init           = decode_init,
     .close          = decode_end,
     .decode         = decode_frame,
+    .capabilities   = CODEC_CAP_DR1,
     .long_name      = NULL_IF_CONFIG_SMALL("Discworld II BMV video"),
 };