add two new audio ioctls, AUDIO_GETPRINFO and AUDIO_GETRRINFO, and the

data structure these ioctls use, audio_bufinfo.

these ioctls return information about the play and record buffers
into the audio_bufinfo structure.

these are being added to aid in porting non-native audio applications
and libraries, and to fix issues in our OSS audio emulation.  these
ioctls exist only on OpenBSD and should not be used in code intended
for distribution.

ok ratchov

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