fix un/install windows build
2.2.0-837

Change-Id: Iaea2e4330af6273507fc25dad77be26168b4c297
Reviewed-on: http://review.couchbase.org/33830
Tested-by: Thuan Nguyen <soccon@gmail.com>
Reviewed-by: Ketaki Gangal <ketakigangal@gmail.com>