CBQE-983: changes in find_file for windows

Change-Id: I6acfbf5d24a982e8c6b5af9b2babbd10622349bf
Reviewed-on: http://review.couchbase.org/24687
Reviewed-by: Andrei Baranouski <andrei.baranouski@gmail.com>
Tested-by: Andrei Baranouski <andrei.baranouski@gmail.com>