[CM] No Auto Connect

[Bill Schottstaedt]

I'd recommend MUS_JACK_AUTOCONNECT -- shorter, simpler to understand,
and the default can still be true, if you want.

Is this something that has to happen before the extension language is
initialized? 

(sndlib's current notion of scanning the hardware at initialization to see
what's available may not make sense in ALSA/JACK -- ALSA basically
lies saying "yes, we got tomatoes", and the latest version segfaults
if you ask for anything specific about the "default" capture device -- 
gad, this thing is a pain.)