set CODEC_CAP_DR1 for vp5 and vp6 decoders

Originally committed as revision 8896 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/vp5.c

@@ -287,4 +287,5 @@ AVCodec vp5_decoder = {
     NULL,
     vp56_free,
     vp56_decode_frame,
+    CODEC_CAP_DR1,
 };

libavcodec/vp6.c

@@ -541,6 +541,7 @@ AVCodec vp6_decoder = {
     NULL,
     vp56_free,
     vp56_decode_frame,
+    CODEC_CAP_DR1,
 };
 
 /* flash version, not flipped upside-down */
@@ -553,4 +554,5 @@ AVCodec vp6f_decoder = {
     NULL,
     vp56_free,
     vp56_decode_frame,
+    CODEC_CAP_DR1,
 };