7908 add loader manpage to pkg://system/boot/loader
Reviewed by: Peter Tribble <peter.tribble@gmail.com>
Reviewed by: Yuri Pankov <yuripv@gmx.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>