AudioCommon: get rid of Update(), it never does anything

Source/Core/AudioCommon/AlsaSoundStream.cpp

@@ -41,11 +41,6 @@ bool AlsaSound::Init()
   return true;
 }
 
-void AlsaSound::Update()
-{
-  // don't need to do anything here.
-}
-
 // Called on audio thread.
 void AlsaSound::SoundLoop()
 {

Source/Core/AudioCommon/AlsaSoundStream.h

@@ -24,7 +24,6 @@ public:
 
   bool Init() override;
   void SoundLoop() override;
-  void Update() override;
   bool SetRunning(bool running) override;
 
   static bool isValid() { return true; }

Source/Core/AudioCommon/AudioCommon.cpp

@@ -197,8 +197,6 @@ void SendAIBuffer(const short* samples, unsigned int num_samples)
   {
     pMixer->PushSamples(samples, num_samples);
   }
-
-  g_sound_stream->Update();
 }
 
 void StartAudioDump()

Source/Core/AudioCommon/NullSoundStream.cpp

@@ -20,7 +20,3 @@ bool NullSound::SetRunning(bool running)
 void NullSound::SetVolume(int volume)
 {
 }
-
-void NullSound::Update()
-{
-}

Source/Core/AudioCommon/NullSoundStream.h

@@ -12,7 +12,6 @@ public:
   void SoundLoop() override;
   bool SetRunning(bool running) override;
   void SetVolume(int volume) override;
-  void Update() override;
 
   static bool isValid() { return true; }
 };

Source/Core/AudioCommon/OpenALStream.cpp

@@ -126,9 +126,6 @@ bool OpenALStream::Init()
 OpenALStream::~OpenALStream()
 {
   m_run_thread.Clear();
-  // kick the thread if it's waiting
-  m_sound_sync_event.Set();
-
   m_thread.join();
 
   palSourceStop(m_source);
@@ -155,11 +152,6 @@ void OpenALStream::SetVolume(int volume)
     palSourcef(m_source, AL_GAIN, m_volume);
 }
 
-void OpenALStream::Update()
-{
-  m_sound_sync_event.Set();
-}
-
 bool OpenALStream::SetRunning(bool running)
 {
   if (running)

Source/Core/AudioCommon/OpenALStream.h

@@ -59,7 +59,6 @@ public:
   void SoundLoop() override;
   void SetVolume(int volume) override;
   bool SetRunning(bool running) override;
-  void Update() override;
 
   static bool isValid();
 
@@ -67,8 +66,6 @@ private:
   std::thread m_thread;
   Common::Flag m_run_thread;
 
-  Common::Event m_sound_sync_event;
-
   std::vector<short> m_realtime_buffer;
   std::array<ALuint, OAL_BUFFERS> m_buffers;
   ALuint m_source;

Source/Core/AudioCommon/SoundStream.h

@@ -21,7 +21,6 @@ public:
   virtual bool Init() { return false; }
   virtual void SetVolume(int) {}
   virtual void SoundLoop() {}
-  virtual void Update() {}
   // Returns true if successful.
   virtual bool SetRunning(bool running) { return false; }
 };