fix errors related to old sdk

src/Windows/Avalonia.Win32/Win32NativeToManagedMenuExporter.cs

@@ -33,7 +33,7 @@ namespace Avalonia.Win32
                     }
                     else if (item.HasClickHandlers && item is INativeMenuItemExporterEventsImplBridge bridge)
                     {
-                        newItem.Click += (_, _) => bridge.RaiseClicked();
+                        newItem.Click += (_, __) => bridge.RaiseClicked();
                     }
 
                     yield return newItem;