m: Fix extant errors

Signed-off-by: John Nunley <[email protected]>

tests/daisy_chain.rs

@@ -0,0 +1,2 @@
+use event_listener::Event;
+use std::thread;

tests/rwlock.rs

@@ -7,6 +7,7 @@ use futures_lite::{future, prelude::*, ready};
 
 use std::pin::Pin;
 use std::sync::atomic::{AtomicBool, AtomicUsize, Ordering};
+#[cfg(not(target_family = "wasm"))]
 use std::sync::Arc;
 use std::task::Poll;