Fix android_runtime_lock not being cfg guarded (#5244)

The `android_runtime_lock` wasn't properly `cfg` guarded in various
places, so it got included on all operating systems, not just Android by
accident. This causes deadlocks when trying to use `muda`.

packages/desktop/src/app.rs

@@ -330,9 +330,9 @@ impl App {
                     {
                         // This is a place where wry says it's threadsafe but it's actually not.
                         // If we're patching the app, we want to make sure it's not going to progress in the interim.
-                        let lock = crate::android_sync_lock::android_runtime_lock();
+                        #[cfg(target_os = "android")]
+                        let _lock = crate::android_sync_lock::android_runtime_lock();
                         dioxus_devtools::apply_changes(&webview.dom, &hr_msg);
-                        drop(lock);
                     }
 
                     webview.poll_vdom();