avcodec/diracdec: Don't use EDGE_WIDTH from mpegpicture.h

There is nothing that forces us to use the same value
as mpegvideo_enc.c, so define our own constant.

Reviewed-by: Lynne <dev@lynne.ee>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

libavcodec/diracdec.c

@@ -37,14 +37,15 @@
 #include "golomb.h"
 #include "dirac_arith.h"
 #include "dirac_vlc.h"
-#include "mpegpicture.h"
 #include "mpegvideoencdsp.h"
 #include "dirac_dwt.h"
 #include "dirac.h"
 #include "diractab.h"
 #include "diracdsp.h"
 #include "videodsp.h"
 
+#define EDGE_WIDTH 16
+
 /**
  * The spec limits this to 3 for frame coding, but in practice can be as high as 6
  */