More base-derived fixes

src/core/hle/kernel/thread.h

@@ -66,6 +66,11 @@ public:
     virtual ~WakeupCallback() = default;
     virtual void WakeUp(ThreadWakeupReason reason, std::shared_ptr<Thread> thread,
                         std::shared_ptr<WaitObject> object) = 0;
+
+private:
+    template <class Archive>
+    void serialize(Archive& ar, const unsigned int) {}
+    friend class boost::serialization::access;
 };
 
 class ThreadManager {