Accept -listenfd and pass on to Xwayland

tests/integration.rs

@@ -3,7 +3,7 @@ use rustix::process::{Pid, Signal, WaitOptions};
 use std::collections::HashMap;
 use std::io::Write;
 use std::mem::ManuallyDrop;
-use std::os::fd::{AsRawFd, BorrowedFd};
+use std::os::fd::{AsRawFd, BorrowedFd, OwnedFd};
 use std::os::unix::net::UnixStream;
 use std::sync::{
     atomic::{AtomicBool, Ordering},
@@ -72,6 +72,10 @@ impl xwls::RunData for TestData {
         None
     }
 
+    fn listenfds(&mut self) -> Vec<OwnedFd> {
+        Vec::new()
+    }
+
     fn server(&self) -> Option<UnixStream> {
         let mut server = self.server.lock().unwrap();
         assert!(server.is_some());