alsa and audioio testing needed for dsound patch

[Robert Reif]

This patch insures that the hardware primary buffer
is deleted and recreated properly when changing
the primary format.  It also makes sure the proper
frequency adjust is calculated for the actual format
used rather than the requested one.

This should only affect oss, alsa, and audioio and I
have tested oss already.  Please test it with the dsound
tests in the interactive mode so sounds are actually played.
Make sure "HardwareAcceleration" in the config file is
not set to 'Emulation" so the dsound HAL driver is used.

Thanks,

Bob.