Thread: remove the thread from the thread list when exiting

src/core/hle/kernel/thread.h

@@ -252,6 +252,11 @@ void WaitCurrentThread_WaitSynchronization(std::vector<SharedPtr<WaitObject>> wa
  */
 void WaitCurrentThread_ArbitrateAddress(VAddr wait_address);
 
+/**
+ * Stops the current thread and removes it from the thread_list
+ */
+void ExitCurrentThread();
+
 /**
  * Initialize threading
  */