Fix support for running debootstrap on a FreeBSD host to create a kFreeBSD chroot or jail.
This worked in squeeze, as documented here: http://blog.vx.sk/archives/22-Updated-Tutorial-Debian-GNUkFreeBSD-in-a-FreeBSD-jail.html But recent changes to differentiate between the host and target ARCH/OS broke it. All that's needed to get it back is to detect FreeBSD's uname output. Untested.
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