Fix checks for ntohll for MSVC 2013

Change-Id: I58e8999bda6b5e4c42742122c8fb03745cd2dc8d
Reviewed-on: http://review.couchbase.org/30086
Reviewed-by: Trond Norbye <trond.norbye@gmail.com>
Tested-by: Trond Norbye <trond.norbye@gmail.com>