bug#16637: 24.3.50; menubar height is wrong

[martin rudalics]

> 1. Get rid of the toolbar by 'M-x tool-bar-mode'
> 2. 'M-x toggle-frame-fullscreen'
> 3. 'M-x menu-bar-mode'
>
> The frame height is too high. The frame extends above the top of the
> screen and below the bottom of the screen, meaning the menubar height
> is couted with a wrong value.

This should work with current trunk.  Please have a look.

Thanks, martin