bug#43177: Bug: Emacs 27.1 hangs forever in `FcCharSetSubtractCount' from '/usr/lib/libfontconfig.so.1'

[Eli Zaretskii]

> From: Robert Pluim <rpluim@gmail.com>
> Cc: schwab@linux-m68k.org,  43177@debbugs.gnu.org,
>   emacs@Alexander.Shukaev.name
> Date: Fri, 04 Sep 2020 16:04:35 +0200
> 
>     Eli> Shouldn't we query those other backends if the first one couldn't 
> find
>     Eli> a font, even if the variable is nil?  Otherwise, this change could
>     Eli> cause regressions in some (hopefully rare) cases, whereby some
>     Eli> characters will display as hex codes where previously they were shown
>     Eli> using some font.
> 
> Thatʼs what this does.

Then I guess we should install it.