[Fontconfig] performance patch: reduce stat () call if all cache files can be trusted

[Mike FABIAN]

Takashi IWAI <tiwai at suse.de> made a patch to reduce the amount of stat
() calls in the case when one is absolutely sure that all cache files
are OK and up-to-date and can be trusted. 

For details see

    http://bugzilla.novell.com/show_bug.cgi?id=148361

from comment #20 on.

There are problems if the cache files are not correct of course,
but nevertheless Takashi's patch might be a useful performance hack
if a user is able to make sure that all cache files can be trusted.

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-- 
Mike FABIAN   <mfabian at suse.de>   http://www.suse.de/~mfabian
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