How do I delete menus and menu options?
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The simplest way to remove a menu is to set its keymap to `nil'.
For example, to delete the `Words' menu (Note:Modifying pull-down
menus), use:
(define-key global-map [menu-bar words] nil)
Similarly, removing a menu option requires redefining a keymap entry
to `nil'. For example, to delete the `Forward word' menu option from
the `Edit' menu (we added it in Note:Modifying pull-down menus), use:
(define-key global-map [menu-bar edit forward] nil)