The dirname output change bug is actively being worked on, and this
commit will need to be reverted once it's fixed.
MFC after: never
PR: 212193
Sponsored by: EMC / Isilon Storage Division
minus the vendor Makefiles
Provide directions for how to bootstrap the vendor sources in
FREEBSD-upgrade
MFC after 2 weeks
Discussed with: rpaulo
Sponsored by: EMC / Isilon Storage Division