patch 8.0.1143: macros always expand to the same thing

Problem:    Macros always expand to the same thing.
Solution:   Remove W_VSEP_WIDTH() and W_STATUS_HEIGHT().
diff --git a/src/structs.h b/src/structs.h
index 946857b..7b0f70c 100644
--- a/src/structs.h
+++ b/src/structs.h
@@ -2702,8 +2702,8 @@
     int		w_status_height;    /* number of status lines (0 or 1) */
     int		w_wincol;	    /* Leftmost column of window in screen. */
     int		w_width;	    /* Width of window, excluding separation. */
-    int		w_vsep_width;	    /* Number of separator columns (0 or 1).
-				       use W_VSEP_WIDTH() */
+    int		w_vsep_width;	    /* Number of separator columns (0 or 1). */
+
     /*
      * === start of cached values ====
      */