Remove right_available member from VP9_COMP

This member of VP9_COMP is no longer used, so I removed it.

Change-Id: I3509f52756da4768a3e4581cec5ed5d2a70d5fb8

vp9/common/vp9_blockd.h

@@ -204,7 +204,6 @@ typedef struct macroblockd {
 
   int up_available;
   int left_available;
-  int right_available;
 
   /* Distance of MB away from frame edges */
   int mb_to_left_edge;

vp9/common/vp9_onyxc_int.h

@@ -281,7 +281,6 @@ static void set_mi_row_col(VP9_COMMON *cm, MACROBLOCKD *xd,
   // Are edges available for intra prediction?
   xd->up_available    = (mi_row != 0);
   xd->left_available  = (mi_col > cm->cur_tile_mi_col_start);
-  xd->right_available = (mi_col + bw < cm->cur_tile_mi_col_end);
 }
 
 static void set_prev_mi(VP9_COMMON *cm) {