Attempt to move mixer to audio common, it's a bit more complicated than I expected

so please check I didn't break anything in hle



git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@2756 8ced0084-cf51-0410-be5f-012b33b47a6e

Source/Core/AudioCommon/Src/AudioCommon.h

@@ -0,0 +1,18 @@
+#ifndef _AUDIO_COMMON_H
+#define _AUDIO_COMMON_H
+
+#include "Common.h"
+#include "pluginspecs_dsp.h"
+#include "SoundStream.h"
+
+class CMixer;
+
+extern DSPInitialize g_dspInitialize;
+extern SoundStream *soundStream;
+
+namespace AudioCommon {
+	
+	SoundStream *InitSoundStream(std::string backend, CMixer *mixer = NULL);
+} // Namespace	
+
+#endif // AUDIO_COMMON