bug#20484: EMACS=t Joy and Happiness

[Paul Eggert]

Eli Zaretskii wrote:

> I like it because it is future proof, and makes our burden of
> remembering this issue easier.
>
> Thanks.

You're welcome. Stefan privately emailed me some helpful comments that improved 
the patch (thanks!), and I installed the attached into master. In the hope that 
this has laid Bug#20202 to rest (at least on modern GNU systems running Bash 4.4 
or later), I'm boldly closing the bug report.

0001-Don-t-set-EMACS-t-if-Bash-is-4.4-or-newer.txt
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