go.crypto/ssh/terminal: enable freebsd build

syscall.Termios, which was the only thing breaking the build, is
available in go tip now
(https://code.google.com/p/go/source/detail?r=873d664b00ec)

R=golang-codereviews, bradfitz
CC=golang-codereviews
https://golang.org/cl/51690043
2 files changed
tree: 5c085e578d4d9ae565da4624b7eda1a163dfa8e6
  1. terminal.go
  2. terminal_test.go
  3. util.go
  4. util_bsd.go
  5. util_linux.go