bug#59347: 29.0.50; `:family` face setting ignored

[Eli Zaretskii]

> From: Stefan Monnier <monnier@iro.umontreal.ca>
> Cc: Gregory Heytings <gregory@heytings.org>,  Eli Zaretskii <eliz@gnu.org>,
>   59347@debbugs.gnu.org
> Date: Mon, 12 Dec 2022 10:30:10 -0500
> 
> Your patch made the C code more complex (not just slower) for the
> benefit of a cleaner ELisp-level interface.  A better way to get that
> same result would be to write an ELisp function on top of Gregory's
> bitmask variable.
> This way, you'd get a clean&simple&efficient C code still with
> a convenient ELisp API.
> 
> Any chance someone could do that so we can move on?

I suggested a simple way out of this, I hope you like it.  If there
are no objections, I will implement it soon.