Use gettimeofday for win32 as well

Change-Id: I592e7098f32a066f63c181d54811d21f7943ad2f
Reviewed-on: http://review.couchbase.org/31627
Tested-by: Trond Norbye <trond.norbye@gmail.com>
Reviewed-by: Dave Rigby <daver@couchbase.com>