Use IoctlSetPointerInt from golang.org/x/sys/unix
Use IoctlSetPointerInt from golang.org/x/sys/unix

Use unix.IoctlSetPointerInt instead of manually implementing it. This
fixes the build on darwin where direct syscalls, i.e.
unix.Syscall(SYS_IOCTL, ...) are no longer allowed and exported as of
golang/sys@6fcdbc0

Signed-off-by: Tobias Klauser <9249c549618448e4c699e8032ba6c7f0d7fd4b7f@distanz.ch>

containerd/console