Add missing mv_{col,row}_{min,max}_sb variables to MACROBLOCK struct.

This allows CONFIG_SUPERBLOCKS experiment to almost compile succesfully,
except for the missing pick_sb_modes() function.

Change-Id: Ib2322f2aacdc371e8066f2eb4a8d761c40490b4d

vp8/encoder/block.h

@@ -134,6 +134,12 @@ typedef struct
     int mv_col_max;
     int mv_row_min;
     int mv_row_max;
+#if CONFIG_SUPERBLOCKS
+    int mv_col_min_sb;
+    int mv_col_max_sb;
+    int mv_row_min_sb;
+    int mv_row_max_sb;
+#endif
 
     int skip;