A+C: Steve McCoy (individual CLA)

Generated by addca.

R=gobot
CC=golang-dev
https://codereview.appspot.com/7608044
cgo: enable external linking mode on FreeBSD amd64.

Tested on FreeBSD 9.1 amd64, per rsc's instructions at
https://groups.google.com/d/topic/golang-dev/HjRTLvRsJXo/discussion .

R=golang-dev, lucio.dere, devon.odell, rsc
CC=golang-dev
https://codereview.appspot.com/7664044

Committer: Russ Cox <rsc@golang.org>