by not linking in other Unix audio modules.
Use kAudioUnitSubType_DefaultOutput instead of kAudioUnitSubType_HALOutput
so that a runtime switch to another audio device is automatically handled.
Use ERROR_LOG for audio errors.
git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@5562 8ced0084-cf51-0410-be5f-012b33b47a6e