Fix build problem on W2008 in /xp /x86 /release mode

Change-Id: I1d51e4f9b1e0ae9f6df28a22bf13a5ab6bf55ab8
Reviewed-on: http://review.couchbase.org/28476
Reviewed-by: Trond Norbye <trond.norbye@gmail.com>
Tested-by: Trond Norbye <trond.norbye@gmail.com>