Remove clean option

MFC after:5 days


git-svn-id: svn+ssh://svn.freebsd.org/base/head@271726 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f
Remove clean option

MFC after:5 days


git-svn-id: svn+ssh://svn.freebsd.org/base/head@271727 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f