update build script to handle passenger enterprise
update build script to handle passenger enterprise

We provide a Passenger Enterprise Homebrew formula now, so we need to uninstall it during the forumla update task or brew linking will fail and fail the rake task.
[ci skip]
[ci:skip]

phusion/passenger,phusion/passenger,phusion/passenger,phusion/passenger,phusion/passenger,phusion/passenger,phusion/passenger,phusion/passenger