Merge pull request #882 from lioncash/unused

kernel/thread: Remove unimplemented function prototype

src/core/hle/kernel/thread.h

@@ -287,12 +287,6 @@ Thread* GetCurrentThread();
  */
 void WaitCurrentThread_Sleep();
 
-/**
- * Waits the current thread from an ArbitrateAddress call
- * @param wait_address Arbitration address used to resume from wait
- */
-void WaitCurrentThread_ArbitrateAddress(VAddr wait_address);
-
 /**
  * Stops the current thread and removes it from the thread_list
  */