[Zynaddsubfx-user] JACK reconnect patch

[Benjamin F. <zyn...@so...>]

The attached patch for JACKaudiooutput.C is a *quick hack* for working
around the JACK zombification problem.  This patch does two things:

1. It modifies the initialization for the JACK audio driver, so that it
asks JACK for a list of physical outputs, and then immediately connects
to the first pair.
2. It modifies the shutdown handler for the JACK audio driver so that
the initialization routine is immediately called, thereby
re-establishing the output connection.

The result is that audio output from the synth continues with nothing
more than a bit of crackling during the reconnect.

The main problem with this approach is that ZynAddSubFX might have been
connected to ports other than the main physical output pair - such as
tracks in Ardour.  These connections would not be automatically
restored.  Nonetheless, the patch works well enough for my purposes at
the moment, and I hope it will be helpful to others on this list.

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