Mark the audio streams as final.

These aren't intended to be continually extended.

Source/Core/AudioCommon/AOSoundStream.h

@@ -11,7 +11,7 @@
 #include <ao/ao.h>
 #endif
 
-class AOSound : public SoundStream
+class AOSound final : public SoundStream
 {
 #if defined(HAVE_AO) && HAVE_AO
 	std::thread thread;

Source/Core/AudioCommon/AlsaSoundStream.h

@@ -12,7 +12,7 @@
 #include "Common/Common.h"
 #include "Common/Thread.h"
 
-class AlsaSound : public SoundStream
+class AlsaSound final : public SoundStream
 {
 #if defined(HAVE_ALSA) && HAVE_ALSA
 public:

Source/Core/AudioCommon/CoreAudioSoundStream.h

@@ -10,7 +10,7 @@
 
 #include "AudioCommon/SoundStream.h"
 
-class CoreAudioSound : public SoundStream
+class CoreAudioSound final : public SoundStream
 {
 #ifdef __APPLE__
 public:

Source/Core/AudioCommon/DSoundStream.h

@@ -15,7 +15,7 @@
 #define BUFSIZE (1024 * 8 * 4)
 #endif
 
-class DSound : public SoundStream
+class DSound final : public SoundStream
 {
 #ifdef _WIN32
 	std::thread thread;

Source/Core/AudioCommon/NullSoundStream.h

@@ -9,7 +9,7 @@
 
 #define BUF_SIZE (48000 * 4 / 32)
 
-class NullSound : public SoundStream
+class NullSound final : public SoundStream
 {
 	// playback position
 	short realtimeBuffer[BUF_SIZE / sizeof(short)];

Source/Core/AudioCommon/OpenALStream.h

@@ -40,7 +40,7 @@
 #define FRAME_SURROUND_FLOAT    SURROUND_CHANNELS * SIZE_FLOAT
 #endif
 
-class OpenALStream: public SoundStream
+class OpenALStream final : public SoundStream
 {
 #if defined HAVE_OPENAL && HAVE_OPENAL
 public:

Source/Core/AudioCommon/OpenSLESStream.h

@@ -7,7 +7,7 @@
 #include "AudioCommon/SoundStream.h"
 #include "Common/Thread.h"
 
-class OpenSLESStream : public SoundStream
+class OpenSLESStream final : public SoundStream
 {
 #ifdef ANDROID
 public:

Source/Core/AudioCommon/PulseAudioStream.h

@@ -14,7 +14,7 @@
 #include "Common/Common.h"
 #include "Common/Thread.h"
 
-class PulseAudio : public SoundStream
+class PulseAudio final : public SoundStream
 {
 #if defined(HAVE_PULSEAUDIO) && HAVE_PULSEAUDIO
 public:

Source/Core/AudioCommon/XAudio2Stream.h

@@ -21,7 +21,7 @@ struct IXAudio2MasteringVoice;
 
 #endif
 
-class XAudio2 : public SoundStream
+class XAudio2 final : public SoundStream
 {
 #ifdef _WIN32
 

Source/Core/AudioCommon/XAudio2_7Stream.h

@@ -26,7 +26,7 @@ struct IXAudio2MasteringVoice;
 
 #endif
 
-class XAudio2_7 : public SoundStream
+class XAudio2_7 final : public SoundStream
 {
 #ifdef _WIN32