Downgrade Rust edition to 2021 in all crates for compatibility

Author: aosoft

unity-native-plugin-sample/src/lib.rs

@@ -9,7 +9,7 @@ unity_native_plugin::unity_native_plugin_entry_point! {
     }
 }
 
-#[no_mangle]
+#[unsafe(no_mangle)]
 #[allow(non_snake_case)]
 extern "system" fn FillTexture(unity_texture: *mut IUnknown, x: f32, y: f32, z: f32, w: f32) {
     unsafe {

unity-native-plugin-tester/Cargo.toml

@@ -2,7 +2,7 @@
 name = "unity-native-plugin-tester"
 version = "0.8.0"
 authors = ["Yasuhiro Taniuchi"]
-edition = "2024"
+edition = "2021"
 license = "MIT"
 description = "Unity Native Plugin API Tester Library"
 homepage = "https://github.com/aosoft/unity-native-plugin-rs"

unity-native-plugin/src/lib.rs

@@ -27,7 +27,7 @@ macro_rules! unity_native_plugin_entry_point {
         fn $method_load($p: $t) $body_load
         fn $method_unload() $body_unload
 
-        #[no_mangle]
+        #[unsafe(no_mangle)]
         #[allow(non_snake_case)]
         extern "system" fn UnityPluginLoad(
             interfaces: *mut unity_native_plugin::IUnityInterfaces,
@@ -36,7 +36,7 @@ macro_rules! unity_native_plugin_entry_point {
             $method_load(unity_native_plugin::interface::UnityInterfaces::get());
         }
 
-        #[no_mangle]
+        #[unsafe(no_mangle)]
         #[allow(non_snake_case)]
         extern "system" fn UnityPluginUnload() {
             $method_unload();