bug#4789: use bootstrap-emacs to build emacs/leim directory, load emacs/leim/leim-list.el to loadup.el

[Eli Zaretskii]

> From: Glenn Morris <rgm@gnu.org>
> Date: Mon, 09 Apr 2012 03:20:10 -0400
> 
> On GNU/Linux, leim-list.el is now generated with bootstrap-emacs
> (see 2012-04-09 change to src/Makefile.in).

Is there any special reason to do that with bootstrap-emacs and not
with a "normal" emacs?  I'm asking because there's no bootstrap-emacs
on Windows.