Update softmixer.rs to use AtomicU64 from atomic_shim, so that librespot works with MIPS and MIPSEL (#1461)

* Update softmixer.rs

Use AtomicU64 from atomic_shim, so that librespot works with MIPS and MIPSEL

* Update Cargo.toml with atomic-shim dependency

Added atomic-shim dependency

* Update Cargo.lock with atomic-shim package

Added atomic-shim package

Author: humaita-github

Cargo.lock

@@ -21,6 +21,7 @@ path = "../metadata"
 version = "0.6.0-dev"
 
 [dependencies]
+atomic-shim = "0.2.0"
 futures-util = "0.3"
 log = "0.4"
 parking_lot = { version = "0.12", features = ["deadlock_detection"] }

playback/Cargo.toml

@@ -1,4 +1,5 @@
-use std::sync::atomic::{AtomicU64, Ordering};
+use atomic_shim::AtomicU64;
+use std::sync::atomic::Ordering;
 use std::sync::Arc;
 
 use super::VolumeGetter;