[PATCH] improve performance of stat() operations (e.g. ls -lR)

[Don Bowman]

The attached patch adds a new CYGWIN environment variable, statquery. This
causes stat() to use set_query_open(TRUE) all the time, which
dramatically improves the performance on e.g. ls -lR operations or
configure.
For example, an ls -lR of the 'ntop' distribution goes from 34seconds
to 2seconds on my computer on a local filesystem. The actual change
is extremely trivial.


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