Merge pull request #4129 from sj6219/theta

ios build

src/flutter.rs

@@ -1045,3 +1045,7 @@ pub fn start_global_event_stream(s: StreamSink<String>, app_type: String) -> Res
 pub fn stop_global_event_stream(app_type: String) {
     let _ = GLOBAL_EVENT_STREAM.write().unwrap().remove(&app_type);
 }
+
+#[no_mangle]
+unsafe extern "C" fn get_rgba() {
+}