bug#51381: HEIF image format support

[Eli Zaretskii]

> From: Lars Ingebrigtsen <larsi@gnus.org>
> Cc: stefan@marxist.se,  51381@debbugs.gnu.org
> Date: Fri, 29 Oct 2021 16:06:48 +0200
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > Then why are you spending so much time on this subject
> 
> Am I?  I wasn't aware.

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