Auto merge of #2521 - de-vri-es:tiocm-solarish, r=JohnTitor

Add TIOCM_* constants for Illumos and Solaris.

Values taken from https://github.com/illumos/illumos-gate/blob/252adeb303174e992b64771bf9639e63a4d55418/usr/src/uts/common/sys/termios.h#L466-L476

Since Illumos forked from OpenSolaris 10, I'm assuming that Solaris is still using the same values for binary compatibility. But since Solaris is no longer open source, I couldn't find a way to verify it myself.

src/unix/solarish/mod.rs

@@ -1981,6 +1981,18 @@ pub const TIOCMGET: ::c_int = tIOC | 29;
 pub const TIOCREMOTE: ::c_int = tIOC | 30;
 pub const TIOCSIGNAL: ::c_int = tIOC | 31;
 
+pub const TIOCM_LE: ::c_int = 0o0001;
+pub const TIOCM_DTR: ::c_int = 0o0002;
+pub const TIOCM_RTS: ::c_int = 0o0004;
+pub const TIOCM_ST: ::c_int = 0o0010;
+pub const TIOCM_SR: ::c_int = 0o0020;
+pub const TIOCM_CTS: ::c_int = 0o0040;
+pub const TIOCM_CAR: ::c_int = 0o0100;
+pub const TIOCM_CD: ::c_int = TIOCM_CAR;
+pub const TIOCM_RNG: ::c_int = 0o0200;
+pub const TIOCM_RI: ::c_int = TIOCM_RNG;
+pub const TIOCM_DSR: ::c_int = 0o0400;
+
 pub const EPOLLIN: ::c_int = 0x1;
 pub const EPOLLPRI: ::c_int = 0x2;
 pub const EPOLLOUT: ::c_int = 0x4;