[mythtv] ALSA audio capture

[Nigel Pearson]

> - define a HAVE_AUDIO_INPUT which is defined if OSS or ALSA is used.
> This would replace some of the HAVE_SYS_SOUNDCARD... stuff.

Note that Mac OS X (and Windows) have neither OSS or ALSA,
so any audio capture stuff needs a fallthrough of some kind.


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