Build 64-bit version for windows

Change-Id: I99b560f0b918778784c810c6a3d324e80f4e40d4
Reviewed-on: http://review.couchbase.org/30001
Reviewed-by: Sergey Avseyev <sergey.avseyev@gmail.com>
Tested-by: Sergey Avseyev <sergey.avseyev@gmail.com>