bug#27350: #27350 25.2; Make `inhibit-compacting-font-caches' customizable

[Eli Zaretskii]

> From: "Felix E. Klee" <felix.klee@inka.de>
> Date: Fri, 16 Jun 2017 12:20:48 +0200
> Cc: 27350@debbugs.gnu.org
> 
> FYI, a 2005 fontconfig bug report about slowness when loading MingLiU:
> 
> https://bugs.freedesktop.org/show_bug.cgi?id=3838
> 
> The solution is caching: “TrueType fonts are broken in various ways;
> fontconfig works around this by scanning the entire font once and
> caching the result. That's why it caches things.”

Thanks for that data point.


> Caching is fine with me.

Patches are welcome.  (I know almost nothing about fonts.)