unix: update FreeBSD generated types and errors

Update the generated types and errors for FreeBSD by running mkall.sh
and ensuring no values where removed.

Change-Id: I5b82b1896b64f1b33d569dcaa477bb88641dfa8d
Reviewed-on: https://go-review.googlesource.com/15011
Reviewed-by: Ian Lance Taylor <iant@golang.org>
4 files changed