dxa decoder uses get_buffer, set CODEC_CAP_DR1

Originally committed as revision 19096 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/dxa.c

@@ -330,6 +330,7 @@ AVCodec dxa_decoder = {
     NULL,
     decode_end,
     decode_frame,
+    CODEC_CAP_DR1,
     .long_name = NULL_IF_CONFIG_SMALL("Feeble Files/ScummVM DXA"),
 };