Issue #1373670 by sun: Change constant value of MENU_NOT_FOUND to 404 and...

Issue #1373670 by sun: Change constant value of MENU_NOT_FOUND to 404 and MENU_ACCESS_DENIED to 403.

core/includes/menu.inc

@@ -223,20 +223,15 @@
  * Status codes for menu callbacks.
  */
 
-/**
- * Internal menu status code -- Menu item was found.
- */
-const MENU_FOUND = 1;
-
 /**
  * Internal menu status code -- Menu item was not found.
  */
-const MENU_NOT_FOUND = 2;
+const MENU_NOT_FOUND = 404;
 
 /**
  * Internal menu status code -- Menu item access is denied.
  */
-const MENU_ACCESS_DENIED = 3;
+const MENU_ACCESS_DENIED = 403;
 
 /**
  * Internal menu status code -- Menu item inaccessible because site is offline.