[Fontconfig] Startup cache check

[LRN]

Is there a way to manually run a cache check at startup without rebuilding
the cache?

I'd like to do that, and terminate the program if the cache is not up to
date. The only alternative is to let the application run and let FC
eventually rebuilt the cache, which can take minutes, depending on the
number of fonts and the disk performance. I'd rather tell the user to
update the cache (for which a separate program is available, which is able
to tell the user what's going on and show the caching progress) and exit
instead of seemingly hanging up for minutes.

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