wininet(8/10): Delete cache entries when their use count reaches 0

[Juan Lang]

Note that cache entries now have a usage count of 1 rather than 0, and
remain "in use" until explicitly deleted.  This is deliberate.  At
some future date, a cache scavenger can remove cache entries with a
usage count of 0 or 1, but I haven't implemented that yet.
--Juan
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