- Bugfix: Don't assume OSS is installed in all linux systems.
- Bugfix: Some combinations of VolumeSetLevel and VolumeMute caused VolumeGetString to return Mute when not muted
- Make SDL volume handling the default, since OSS is no longer included in the kernel.
- Minor refactoring of volume handling code.
Personally, I would drop OSS support altogether, since it's deprecated (and some 'user-friendly' distros don't have it enabled by default, e.g. Ubuntu), and it changes the master volume level and 'remembers' it when muted (what if two programs did this?).
