bug#70246: 30.0.50; Update INSTALL for native compilation

[Eli Zaretskii]

> From: Björn Bidar <bjorn.bidar@thaodan.de>
> Cc: Stephen Berman <stephen.berman@gmx.net>,  70246@debbugs.gnu.org
> Date: Sun, 07 Apr 2024 22:28:55 +0300
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> >> +'/usr/local/share/emacs/VERSION/native-lisp' holds the natively compiled
> >> +          pre-loaded Emacs Lisp files.
> >
> > This is incorrect: native-lisp is installed under /usr/lib/emacs/VERSION,
> > not under /usr/share/emacs/VERSION.
> I would add a note that it might be /usr/lib64/emacs/30.0.50 depending
> on the system.

Not by default, AFAIU.  I think you are looking at an installation of
a distro, in which case those who built the distro used the --prefix
option to install in different places.

The file INSTALL describes the defaults set by the configure script,
it cannot possibly describe what distros or individual users do on
their systems.