Globally ignore attribute warnings on Wine side

These started happening after Wine 5.12, and it doesn't look like it's
going to change.

src/wine-host/bridges/vst2.h

@@ -183,18 +183,12 @@ class Vst2Bridge : public HostBridge {
      */
     ScopedValueCache<int> process_level_cache_;
 
-    // FIXME: This emits `-Wignored-attributes` as of Wine 5.22
-#pragma GCC diagnostic push
-#pragma GCC diagnostic ignored "-Wignored-attributes"
-
     /**
      * The shared library handle of the VST2 plugin.
      */
     std::unique_ptr<std::remove_pointer_t<HMODULE>, decltype(&FreeLibrary)>
         plugin_handle_;
 
-#pragma GCC diagnostic pop
-
     /**
      * The loaded plugin's `AEffect` struct, obtained using the above library
      * handle.