Gate the TUI suspend restore helper on Unix (#34578)

Compile `tui::restore` only on Unix, matching its use by the Unix job-control
suspension path.

GitOrigin-RevId: d0ce03def8905e94376ec7f5acf8d083d5dde05b

codex-rs/tui/src/tui.rs

@@ -294,6 +294,7 @@ fn restore_common(
 
 /// Restore the terminal to its original state.
 /// Inverse of `set_modes`.
+#[cfg(unix)]
 pub fn restore() -> Result<()> {
     restore_common(RawModeRestore::Disable, KeyboardRestore::PopStack)
 }