Fix `ioctl` call failing on 32 bit architecture (#1011)

src/tty.rs

@@ -113,10 +113,12 @@ fn openpty(rows: u8, cols: u8) -> (c_int, c_int) {
 /// Really only needed on BSD, but should be fine elsewhere
 fn set_controlling_terminal(fd: c_int) {
     let res = unsafe {
-        // Cross platform issue because on linux this is u64 as u64 (does nothing)
-        // But on macos this is u32 as u64, asking for u64::from(u32)
+        // TIOSCTTY changes based on platform and the `ioctl` call is different
+        // based on architecture (32/64). So a generic cast is used to make sure
+        // there are no issues. To allow such a generic cast the clippy warning
+        // is disabled.
         #[cfg_attr(feature = "clippy", allow(cast_lossless))]
-        libc::ioctl(fd, TIOCSCTTY as u64, 0)
+        libc::ioctl(fd, TIOCSCTTY as _, 0)
     };
 
     if res < 0 {