bug#45455: [nextstep]: Emacs master does not compile on Apple Silicon (arm64)

[Eli Zaretskii]

> Date: Sun, 27 Dec 2020 21:37:23 +0000
> Cc: 45455@debbugs.gnu.org
> From: Artem Loenko via "Bug reports for GNU Emacs,
>  the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>
> 
> I see two options:
> 
> - Backport `arm64:Darwin:*:*)` support within `config.guess` to emacs-27 
> branch and switch to
> `aarch64-apple-darwin` everywhere
> - Do not backport, but switch to `aarch64-apple-darwin` everywhere anyway :)
> 
> What do you think?

The latter, please.  It's too late to backport config.guess to the
release branch, and I see no good reason to do so.