Add nix flake and MacOS build support

Author: GnomedDev

Cargo.lock

@@ -55,6 +55,9 @@ features = ["mp3", "ogg", "wav", "pcm"]
 default-features = false
 version = "0.5.3"
 
+[patch.crates-io]
+audiopus_sys = { git = 'https://github.com/sevenc-nanashi/audiopus_sys', rev = '00e9d16' }
+
 [workspace.dependencies]
 regex = "1"
 anyhow = "1"

Cargo.toml

@@ -0,0 +1,38 @@
+{
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable-small";
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+  outputs =
+    {
+      nixpkgs,
+      flake-utils,
+      ...
+    }:
+    flake-utils.lib.eachDefaultSystem (
+      system:
+      let
+        pkgs = import nixpkgs { inherit system; };
+      in
+      {
+        devShell = pkgs.mkShell {
+          env = {
+            RUSTC_BOOTSTRAP = "1";
+            RUST_SRC_PATH = pkgs.rustPlatform.rustLibSrc;
+          };
+
+          nativeBuildInputs = with pkgs; [
+            rustc
+            cargo
+            clippy
+            rustfmt
+
+            mold
+            cmake
+          ];
+
+          hardeningDisable = [ "fortify" ];
+        };
+      }
+    );
+}

flake.lock

@@ -11,14 +11,14 @@ use tts_core::{
 };
 use tts_tasks::Looper;
 
-#[cfg(unix)]
+#[cfg(target_os = "linux")]
 fn clear_allocator_cache() {
     unsafe {
         libc::malloc_trim(0);
     }
 }
 
-#[cfg(not(unix))]
+#[cfg(not(target_os = "linux"))]
 fn clear_allocator_cache() {}
 
 fn generate_status(