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

Cargo.lock

@@ -169,6 +169,15 @@ dependencies = [
  "syn 2.0.96",
 ]
 
+[[package]]
+name = "atomic-shim"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "67cd4b51d303cf3501c301e8125df442128d3c6d7c69f71b27833d253de47e77"
+dependencies = [
+ "crossbeam-utils",
+]
+
 [[package]]
 name = "atomic-waker"
 version = "1.1.2"
@@ -2133,6 +2142,7 @@ name = "librespot-playback"
 version = "0.6.0-dev"
 dependencies = [
  "alsa",
+ "atomic-shim",
  "cpal",
  "futures-util",
  "glib",

playback/Cargo.toml

@@ -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/src/mixer/softmixer.rs

@@ -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;