Add a utility function to check whether a file exists in the cache

It is similar to _alpm_filecache_find() but does not return a
dynamically allocated memory to user. Thus the user does not need to
free this resource.

Signed-off-by: Anatol Pomozov <anatol.pomozov@gmail.com>
Signed-off-by: Allan McRae <allan@archlinux.org>

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