As of commit b2439251dd ("blueprints: update docker-for-mac.yml
to latest vpnkit packages") the docker-ce package does not need
the vpnkit-expose-port binary anymore. It was also removed from
the linuxkit/vpnkit-forwarder forwarder package with commit
f48a2bfe12 ("pkg: update vpnkit-forwarder") causing the docker-ce
package build to fail.
This commit fixes this by removing the linuxkit/vpnkit-forwarder
package from the docker-ce package build.
Signed-off-by: Rolf Neugebauer <rolf.neugebauer@docker.com>