MB-20342: fix windows build failure time_utils/gethrtime
MB-20342: fix windows build failure time_utils/gethrtime

Change-Id: I130ec3c5d51da6cc81dcc79879edef5b1d916a13
Reviewed-on: http://review.couchbase.org/66622
Reviewed-by: Chiyoung Seo <fcffc23db27b19ee4ebba46695ee6b50e09216a2@couchbase.com>
Tested-by: buildbot <80754af91bfb6d1073585b046fe0a474ce868509@couchbase.com>

wurikiji/forestdb,couchbase/forestdb,hisundar/forestdb,hisundar/forestdb,couchbase/forestdb,wurikiji/forestdb