Doens't build on `arm` and `386` architecture

[markelog]

Output from gox

../../kless/term/sys/sys_unix.go:22: undefined: Termios
../../kless/term/sys/sys_unix.go:24: undefined: TCGETS
../../kless/term/sys/sys_unix.go:33: undefined: Termios
../../kless/term/sys/sys_unix.go:35: undefined: TCSANOW
../../kless/term/sys/sys_unix.go:36: undefined: TCSETS
../../kless/term/sys/sys_unix.go:37: undefined: TCSADRAIN
../../kless/term/sys/sys_unix.go:38: undefined: TCSETSW
../../kless/term/sys/sys_unix.go:39: undefined: TCSAFLUSH
../../kless/term/sys/sys_unix.go:40: undefined: TCSETSF
../../kless/term/sys/sys_unix.go:52: undefined: Winsize
../../kless/term/sys/sys_unix.go:40: too many errors