Auto merge of #957 - matttproud:support/netbsd/terminal-ioctl, r=alexcrichton

netbsdlike: add TIOCSCTTY and TIOCSWINSZ ioctls.

Include ioctl commands for becoming controlling tty and setting window
size.  This enables https://github.com/jwilm/alacritty to be built and
run on OpenBSD 6.3.  NetBSD and kin share the same command constants.

src/unix/bsd/netbsdlike/mod.rs

@@ -547,6 +547,8 @@ pub const TIOCMBIS: ::c_ulong = 0x8004746c;
 pub const TIOCMSET: ::c_ulong = 0x8004746d;
 pub const TIOCSTART: ::c_ulong = 0x2000746e;
 pub const TIOCSTOP: ::c_ulong = 0x2000746f;
+pub const TIOCSCTTY: ::c_ulong = 0x20007461;
+pub const TIOCSWINSZ: ::c_ulong = 0x80087467;
 pub const TIOCM_LE: ::c_int = 0o0001;
 pub const TIOCM_DTR: ::c_int = 0o0002;
 pub const TIOCM_RTS: ::c_int = 0o0004;