[mythtv] Experimental patch: configure detects audio output drivers

[Jeremiah Morris]

This patch extends the mythtv configure script to auto-detect the 
available audio libraries (Alsa, JACK, etc.). Instead of editing 
settings.pro manually to choose the drivers, you just run ./configure 
and it includes whichever drivers are installed on your system. You can 
still exclude drivers with --disable options.

I don't have aRts or JACK available for testing, so bugs in the 
configure tests are quite possible. Any comments on either the style or 
the specific tests are appreciated.

- Jer

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