Fix buildbreak on WIN32

link problem with unresolved symbol for snprintf

Change-Id: If14ca153ff1bbf0e3141f5e4caa6d3d148bfff37
Reviewed-on: http://review.couchbase.org/33902
Tested-by: Trond Norbye <trond.norbye@gmail.com>
Tested-by: buildbot <build@couchbase.com>
Reviewed-by: Volker Mische <volker.mische@gmail.com>