fix(port_std): remove #![feature(atomic_mut_ptr)]

yvt · yvt · commit 41425efa40bf · 2023-03-18T18:30:36.000+09:00
The `atomic_mut_ptr` feature was stabilized by [rust-lang/rust#108419][1]. [1]: rust-lang/rust#108419
diff --git a/src/r3_port_std/src/lib.rs b/src/r3_port_std/src/lib.rs
@@ -1,5 +1,4 @@
 #![feature(cfg_target_has_atomic)] // `#[cfg(target_has_atomic_load_store)]`
-#![feature(atomic_mut_ptr)]
 #![feature(thread_local)]
 #![feature(deadline_api)]
 #![feature(once_cell)]

Original file line number	Diff line number	Diff line change
`@@ -1,5 +1,4 @@`
`1`	`1`	#![feature(cfg_target_has_atomic)] // `#[cfg(target_has_atomic_load_store)]`
`2`		`-#![feature(atomic_mut_ptr)]`
`3`	`2`	`#![feature(thread_local)]`
`4`	`3`	`#![feature(deadline_api)]`
`5`	`4`	`#![feature(once_cell)]`