Added an option in the DSP settings to disable the DPL2 decoder in case Dolphin incorrectly detects a 5.1 audio system. Updated the OpenAL files to OpenAL Soft 1.15.1 in the Windows build. Fixes issue 3023.
git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@7053 8ced0084-cf51-0410-be5f-012b33b47a6e
git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@2801 8ced0084-cf51-0410-be5f-012b33b47a6e