10009 btxld: handle versioning better
Reviewed by: Robert Mustacchi <rm@joyent.com>
Reviewed by: Gergő Mihály Doma <domag02@gmail.com>
Approved by: Richard Lowe <richlowe@richlowe.net>

6698 freebsd btxld port for illumos (loader project)
Reviewed by: Richard Lowe <richlowe@richlowe.net>
Reviewed by: Albert Lee <trisk@omniti.com>
Approved by: Robert Mustacchi <rm@joyent.com>