bug#58771: 29.0.50; context submenu can not click when run emacs lucid build.

[Mike Kupfer]

Po Lu wrote:

> So what I'd like to do is to remove the reference to
> `lucid__menu_grab_keyboard' in the first place, and replace it with a
> define.  Any objections?

Would this also involve removing f_lucid__menu_grab_keyboard from the
emacs_globals struct and removing the corresponding DEFVAR_BOOL in
keyboard.c?  pop_up_menu() is the only place lucid__menu_grab_keyboard
is used.

mike