bug#41242: Port feature/native-comp to Windows

[Eli Zaretskii]

> From: Andrea Corallo <akrl@sdf.org>
> Cc: Eli Zaretskii <eliz@gnu.org>, 41242@debbugs.gnu.org
> Date: Wed, 20 May 2020 17:29:37 +0000
> 
> Sorry, still looking at
> 0003-Handle-setjmp-taking-two-arguments-in-Windows.patch forgot to ask
> if you could comment on this change:
> 
> >                                   comp.char_type,
> > -                                 sizeof (jmp_buf)),
> > +                                 sizeof (sys_jmp_buf)),

I think the latter is more portable, see lisp.h around line 2150.