bug#51296: [PATCH] Add WebP format support

[Eli Zaretskii]

> From: Stefan Kangas <stefan@marxist.se>
> Date: Thu, 21 Oct 2021 14:19:26 -0700
> Cc: 51296@debbugs.gnu.org
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > And if you use SDATA instead of SSDATA?
> 
> Yes, that fixed it.  I guess SSDATA is there specifically to avoid
> casting warnings, but in this case only produced one...

Yes.  The original macro was SDATA, and we added SSDATA later, when
GCC started emitting these annoying warnings.

> > Otherwise, I think this is good to go, thanks.
> 
> Great!  If it's fine by you, I will push this to master tomorrow (or the
> day after) at a time when you are typically online, just in case there
> is any fallout on MS-Windows.

Please go ahead, and thanks.