Forcing WaveOut driver causes Stepmania to not start up on non-Windows

[kyzentun]

If Stepmania can't load the sound driver that is set in the preference, it does not start up. You should not set a sound driver that does not exist on the platform the player is using, because it will break their Stepmania install until they manually fix the preference that you broke.

The next release will have a function for getting the sound driver list so you can write code that doesn't set the preference to something invalid. Also, WaveOut will be the first driver tried, so forcing it probably won't be necessary.

if get_sound_driver_list then
    for i, driver in ipairs(get_sound_driver_list()) do
        if driver == "WaveOut" then
            PREFSMAN:SetPreference("SoundDrivers","WaveOut")
        end
    end
end