4xm decoder uses get_buffer, set CODEC_CAP_DR1

Originally committed as revision 19091 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavcodec/4xm.c

@@ -845,7 +845,7 @@ AVCodec fourxm_decoder = {
     NULL,
     decode_end,
     decode_frame,
-    /*CODEC_CAP_DR1,*/
+    CODEC_CAP_DR1,
     .long_name = NULL_IF_CONFIG_SMALL("4X Movie"),
 };