bug#70246: 30.0.50; Update INSTALL for native compilation

[Eli Zaretskii]

> Date: Sat, 06 Apr 2024 22:53:31 +0200
> From:  Stephen Berman via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
> 
> The INSTALL file in the Emacs sources makes no reference to native
> compilation.  The attached patch is an attempt to fill this gap (but I'm
> not sure about the default locations of installed natively compiled Lisp
> files, since I do not install Emacs when I build and do not have a
> distribution installation of Emacs built with native compilation to
> check).

Thanks.  This LGTM, except the changes to item 6: there, I would only
mention the possibility of building out of the source tree.  Whether
running uninstalled is possible in this case depends where is the
build tree relative to the source tree, so I'd rather not describe all
the gory details there because they are too complex to explain (what
you wrote is inaccurate); I'd just say that running uninstalled is
fully supported only when Emacs is built in the source tree.

> +'/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.