[dev.cc] runtime/cgo: fix freebsd build?
[dev.cc] runtime/cgo: fix freebsd build?

Last try and then someone with a FreeBSD has to do it.

TBR=r
CC=golang-codereviews
https://codereview.appspot.com/171590043

webfd/go-zh,d0f/go-zh,d0f/go-zh,d0f/go-zh,d0f/go-zh,bryanxu/go-zh,webfd/go-zh,bryanxu/go-zh,d0f/go-zh,webfd/go-zh,webfd/go-zh,bryanxu/go-zh,webfd/go-zh,webfd/go-zh,d0f/go-zh,webfd/go-zh,bryanxu/go-zh,bryanxu/go-zh,bryanxu/go-zh,bryanxu/go-zh,d0f/go-zh,d0f/go-zh,bryanxu/go-zh,webfd/go-zh