Merge branch 'fix-tiocgwinsz-dragonfly' into 'master'

Fix TIOCGWINSZ type mismatch on DragonFly

See merge request redox-os/termion!152

src/sys/unix/size.rs

@@ -14,7 +14,7 @@ struct TermSize {
 pub fn terminal_size() -> io::Result<(u16, u16)> {
     unsafe {
         let mut size: TermSize = mem::zeroed();
-        cvt(ioctl(STDOUT_FILENO, TIOCGWINSZ, &mut size as *mut _))?;
+        cvt(ioctl(STDOUT_FILENO, TIOCGWINSZ.into(), &mut size as *mut _))?;
         Ok((size.col as u16, size.row as u16))
     }
 }