Remove extraneous flags from VC builds

Change-Id: Ib7fc4eb1d242e3c60f64144f768129c6e4ced74c
Reviewed-on: http://review.couchbase.org/33286
Reviewed-by: Brett Lawson <brett19@gmail.com>
Tested-by: Mark Nunberg <mnunberg@haskalah.org>