Fix no_std builds

Author: james7132

crates/bevy_platform/src/sync/mutex.rs

@@ -106,7 +106,7 @@ mod implementation {
 
 #[cfg(not(feature = "std"))]
 mod implementation {
-    use crate::sync::{LockResult, TryLockError, TryLockResult};
+    use crate::sync::{TryLockError, TryLockResult};
     use core::fmt;
 
     pub use spin::MutexGuard;

crates/bevy_platform/src/sync/poison.rs

@@ -1,4 +1,4 @@
-//! Provides `LockResult`, `PoisonError`, `TryLockError`, `TryLockResult`
+//! Provides `TryLockError`, `TryLockResult`
 
 use core::{error::Error, fmt};
 

crates/bevy_platform/src/sync/rwlock.rs

@@ -141,7 +141,7 @@ mod implementation {
 
 #[cfg(not(feature = "std"))]
 mod implementation {
-    use crate::sync::{LockResult, TryLockError, TryLockResult};
+    use crate::sync::{TryLockError, TryLockResult};
     use core::fmt;
 
     pub use spin::rwlock::{RwLockReadGuard, RwLockWriteGuard};