(set_menu_bar_lines): Make the function external instead

of static (MS-DOS needs to call it).

src/frame.c

@@ -167,7 +167,7 @@ set_menu_bar_lines_1 (window, n)
     }
 }
 
-static void
+void
 set_menu_bar_lines (f, value, oldval)
      struct frame *f;
      Lisp_Object value, oldval;