bug#12406: 24.2.50; frame parameter `menu-bar-lines' and `menu-bar-mode'

[Drew Adams]

> I never understood things like `tool-bar-lines-needed'.

I never even heard of it before.

But I'm not surprised that such things exist.  The Emacs tool bar has a history
of ugly little hacks and cruftiness.

Oddly enough, BTW, `tool-bar-lines-needed' does not seem to appear anywhere in
the Emacs Lisp code!  It is defined in C for Lisp, but is not used anywhere (in
Emacs 24, at least).