sun rasterfile image decoder uses get_buffer, set CODEC_CAP_DR1

Originally committed as revision 19105 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/sunrast.c

@@ -192,7 +192,7 @@ AVCodec sunrast_decoder = {
     NULL,
     sunrast_end,
     sunrast_decode_frame,
-    0,
+    CODEC_CAP_DR1,
     NULL,
     .long_name = NULL_IF_CONFIG_SMALL("Sun Rasterfile image"),
 };