Original commit message from CVS:
* configure.ac:
* sys/Makefile.am:
* sys/oss4/Makefile.am:
* sys/oss4/oss4-audio.c:
* sys/oss4/oss4-audio.h:
* sys/oss4/oss4-mixer-enum.c:
* sys/oss4/oss4-mixer-enum.h:
* sys/oss4/oss4-mixer-slider.c:
* sys/oss4/oss4-mixer-slider.h:
* sys/oss4/oss4-mixer-switch.c:
* sys/oss4/oss4-mixer-switch.h:
* sys/oss4/oss4-mixer.c:
* sys/oss4/oss4-mixer.h:
* sys/oss4/oss4-property-probe.c:
* sys/oss4/oss4-property-probe.h:
* sys/oss4/oss4-sink.c:
* sys/oss4/oss4-sink.h:
* sys/oss4/oss4-soundcard.h:
* sys/oss4/oss4-source.c:
* sys/oss4/oss4-source.h:
Add initial support for OSSv4. Mixer still needs a bit more love,
but even magic has its limits.