bug#43725: 28.0.50; Include feature/native-comp into master

[Eli Zaretskii]

> From: Andrea Corallo <akrl@sdf.org>
> Cc: 43725@debbugs.gnu.org, Eli Zaretskii <eliz@gnu.org>,
>         Lars Ingebrigtsen
>  <larsi@gnus.org>, monnier@iro.umontreal.ca
> Date: Thu, 18 Feb 2021 21:58:32 +0000
> 
> Side question:  do we all agree that the current configure flag
> '--with-nativecomp' should be '--with-native-comp'?

Yes, '--with-native-comp' sounds better.  Maybe even
'--with-native-compilation', even though it's longer.  (But since this
option will become ON by default, users will not have to type it in
most cases.)