[Fontconfig] Application startup performance

[Nick Alcock]

On 10 Mar 2016, Behdad Esfahbod outgrape:

> Any resolution here?  Current master's behavior of stating all fonts is
> definitely very bad.  Anyone volunteer to clean up the cache code a bit?

I submitted a patch that cleans this up a bit for unchanging fonts -- it
was semi-pulled by Akira (I think) for later investigation. Did anything
come of it?

I can resend if you like.

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