AudioCommon: Add missing override specifiers

Also removes unnecessary virtual keywords.

Source/Core/AudioCommon/AOSoundStream.h

@@ -33,17 +33,15 @@ class AOSound final : public SoundStream
 	short realtimeBuffer[1024 * 1024];
 
 public:
-	virtual bool Start() override;
-
-	virtual void SoundLoop() override;
-
-	virtual void Stop() override;
+	bool Start() override;
+	void SoundLoop() override;
+	void Stop() override;
+	void Update() override;
 
 	static bool isValid()
 	{
 		return true;
 	}
 
-	virtual void Update() override;
 #endif
 };

Source/Core/AudioCommon/AlsaSoundStream.h

@@ -21,17 +21,16 @@ public:
 	AlsaSound();
 	virtual ~AlsaSound();
 
-	virtual bool Start() override;
-	virtual void SoundLoop() override;
-	virtual void Stop() override;
+	bool Start() override;
+	void SoundLoop() override;
+	void Stop() override;
+	void Update() override;
 
 	static bool isValid()
 	{
 		return true;
 	}
 
-	virtual void Update() override;
-
 private:
 	enum class ALSAThreadStatus
 	{

Source/Core/AudioCommon/CoreAudioSoundStream.h

@@ -14,18 +14,17 @@ class CoreAudioSound final : public SoundStream
 {
 #ifdef __APPLE__
 public:
-	virtual bool Start();
-	virtual void SetVolume(int volume);
-	virtual void SoundLoop();
-	virtual void Stop();
+	bool Start() override;
+	void SetVolume(int volume) override;
+	void SoundLoop() override;
+	void Stop() override;
+	void Update() override;
 
 	static bool isValid()
 	{
 		return true;
 	}
 
-	virtual void Update();
-
 private:
 	AudioUnit audioUnit;
 	int m_volume;

Source/Core/AudioCommon/NullSoundStream.h

@@ -15,11 +15,12 @@ class NullSound final : public SoundStream
 	short realtimeBuffer[BUF_SIZE / sizeof(short)];
 
 public:
-	virtual bool Start() override;
-	virtual void SoundLoop() override;
-	virtual void SetVolume(int volume) override;
-	virtual void Stop() override;
-	virtual void Clear(bool mute) override;
+	bool Start() override;
+	void SoundLoop() override;
+	void SetVolume(int volume) override;
+	void Stop() override;
+	void Clear(bool mute) override;
+	void Update() override;
+
 	static bool isValid() { return true; }
-	virtual void Update() override;
 };

Source/Core/AudioCommon/OpenALStream.h

@@ -60,13 +60,14 @@ public:
 	{
 	}
 
-	virtual bool Start() override;
-	virtual void SoundLoop() override;
-	virtual void SetVolume(int volume) override;
-	virtual void Stop() override;
-	virtual void Clear(bool mute) override;
+	bool Start() override;
+	void SoundLoop() override;
+	void SetVolume(int volume) override;
+	void Stop() override;
+	void Clear(bool mute) override;
+	void Update() override;
+
 	static bool isValid() { return true; }
-	virtual void Update() override;
 
 private:
 	std::thread thread;

Source/Core/AudioCommon/OpenSLESStream.h

@@ -13,8 +13,8 @@ class OpenSLESStream final : public SoundStream
 {
 #ifdef ANDROID
 public:
-	virtual bool Start();
-	virtual void Stop();
+	bool Start() override;
+	void Stop() override;
 	static bool isValid() { return true; }
 
 private:

Source/Core/AudioCommon/PulseAudioStream.h

@@ -20,13 +20,12 @@ class PulseAudio final : public SoundStream
 public:
 	PulseAudio();
 
-	virtual bool Start() override;
-	virtual void Stop() override;
+	bool Start() override;
+	void Stop() override;
+	void Update() override;
 
 	static bool isValid() { return true; }
 
-	virtual void Update() override;
-
 	void StateCallback(pa_context *c);
 	void WriteCallback(pa_stream *s, size_t length);
 	void UnderflowCallback(pa_stream *s);

Source/Core/AudioCommon/XAudio2Stream.h

@@ -54,12 +54,12 @@ public:
 	XAudio2();
 	virtual ~XAudio2();
 
-	virtual bool Start();
-	virtual void Stop();
+	bool Start() override;
+	void Stop() override;
 
-	virtual void Update();
-	virtual void Clear(bool mute);
-	virtual void SetVolume(int volume);
+	void Update() override;
+	void Clear(bool mute) override;
+	void SetVolume(int volume) override;
 
 	static bool isValid() { return InitLibrary(); }
 #endif

Source/Core/AudioCommon/XAudio2_7Stream.h

@@ -61,12 +61,12 @@ public:
 	XAudio2_7();
 	virtual ~XAudio2_7();
 
-	virtual bool Start();
-	virtual void Stop();
+	bool Start() override;
+	void Stop() override;
 
-	virtual void Update();
-	virtual void Clear(bool mute);
-	virtual void SetVolume(int volume);
+	void Update() override;
+	void Clear(bool mute) override;
+	void SetVolume(int volume) override;
 
 	static bool isValid() { return InitLibrary(); }
 #endif