Readd the OpenAL option.

The OpenAL backend requires OpenAL Soft to be installed: http://kcat.strangesoft.net/openal.html

You may need to rename soft_oal.dll to OpenAL32.dll in the Dolphin folder.

Windows users may also need to update their OpenAL drivers by downloading them from

http://connect.creativelabs.com/openal/Downloads/oalinst.zip

Source/Core/AudioCommon/Src/AudioCommon.cpp

@@ -110,6 +110,8 @@ namespace AudioCommon
 			backends.push_back(BACKEND_COREAUDIO);
 		if (PulseAudio::isValid())
 			backends.push_back(BACKEND_PULSEAUDIO);
+		if (OpenALStream::isValid())
+			backends.push_back(BACKEND_OPENAL);
 
 		return backends;
 	}