Missing font issue due to broken caches

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I need some comments about making a change in FcCache to work around the kinda race condition in updating caches. please read comments in https://bugs.freedesktop.org/show_bug.cgi?id=69845 for more details of the background.

As attached at https://bugs.freedesktop.org/attachment.cgi?id=116870 I'm proposing the change to store the number of files in a directory to FcCache so that fontconfig can detect this fault; AFAICS the number of font files being reported from the cache and the actual one is different and it is same or newer than the mtime of directory so fontconfig doesn't update then.

The change itself is quite simple and no extra cost to store it. even if it is going to update the cache by this change, it is supposed to be updated per se. the concern is, it may be likely to happen during running applications.

Any other concerns or comment on this change?

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