improve ffi enum data size, fix compile warning on mac

src/ui_cm_interface.rs

@@ -845,6 +845,7 @@ pub fn elevate_portable(_id: i32) {
     }
 }
 
+#[cfg(any(target_os = "android", target_os = "ios", feature = "flutter"))]
 #[inline]
 pub fn handle_incoming_voice_call(id: i32, accept: bool) {
     if let Some(client) = CLIENTS.write().unwrap().get_mut(&id) {
@@ -852,9 +853,10 @@ pub fn handle_incoming_voice_call(id: i32, accept: bool) {
     };
 }
 
+#[cfg(any(target_os = "android", target_os = "ios", feature = "flutter"))]
 #[inline]
 pub fn close_voice_call(id: i32) {
     if let Some(client) = CLIENTS.write().unwrap().get_mut(&id) {
         allow_err!(client.tx.send(Data::CloseVoiceCall("".to_owned())));
     };
-}
+}