Remove compile guards for CONFIG_EXT_INTER

This experiment has been adopted, we can simplify the code
by dropping the associated preprocessor conditionals.

Change-Id: Ic077963f72e8cc2ae9872b58c8a0241988384110
diff --git a/av1/encoder/mcomp.h b/av1/encoder/mcomp.h
index 46a41d2..2c53075 100644
--- a/av1/encoder/mcomp.h
+++ b/av1/encoder/mcomp.h
@@ -58,13 +58,11 @@
 int av1_get_mvpred_av_var(const MACROBLOCK *x, const MV *best_mv,
                           const MV *center_mv, const uint8_t *second_pred,
                           const aom_variance_fn_ptr_t *vfp, int use_mvcost);
-#if CONFIG_EXT_INTER
 int av1_get_mvpred_mask_var(const MACROBLOCK *x, const MV *best_mv,
                             const MV *center_mv, const uint8_t *second_pred,
                             const uint8_t *mask, int mask_stride,
                             int invert_mask, const aom_variance_fn_ptr_t *vfp,
                             int use_mvcost);
-#endif
 
 struct AV1_COMP;
 struct SPEED_FEATURES;
@@ -99,10 +97,8 @@
     int forced_stop,  // 0 - full, 1 - qtr only, 2 - half only
     int iters_per_step, int *cost_list, int *mvjcost, int *mvcost[2],
     int *distortion, unsigned int *sse1, const uint8_t *second_pred,
-#if CONFIG_EXT_INTER
-    const uint8_t *mask, int mask_stride, int invert_mask,
-#endif
-    int w, int h, int use_upsampled_ref);
+    const uint8_t *mask, int mask_stride, int invert_mask, int w, int h,
+    int use_upsampled_ref);
 
 extern fractional_mv_step_fp av1_find_best_sub_pixel_tree;
 extern fractional_mv_step_fp av1_find_best_sub_pixel_tree_pruned;
@@ -123,11 +119,9 @@
 
 int av1_refining_search_8p_c(MACROBLOCK *x, int error_per_bit, int search_range,
                              const aom_variance_fn_ptr_t *fn_ptr,
-#if CONFIG_EXT_INTER
                              const uint8_t *mask, int mask_stride,
-                             int invert_mask,
-#endif
-                             const MV *center_mv, const uint8_t *second_pred);
+                             int invert_mask, const MV *center_mv,
+                             const uint8_t *second_pred);
 
 struct AV1_COMP;