in conjunction with iwi(4). iwi(4) had already been included in HEAD, but
according to Damien Bergamini, there are no plans to MFC it to RELENG_5.
There is an option (WITH_)MODULE to build and install an iwi(4) module
from a snapshot if you're running RELENG_5.
Note: As of the date of this commit, it seems there are issues with the
iwi(4) snapshot and you might experience some problems.
