Compile for pulseaudio

[krisgesling]

As more platforms switch to pulseaudio by default it would be good to compile Mimic1 to explicitly use this.

Raised in MycroftAI/enclosure-picroft#153

[forslund]

I think Alsa as the default is better since it has a pulseaudio wrapper on most systems.

I'll verify that this works (there is an old PR that may be of interest to get merged)

[Batcastle]

This actually has practical uses, as I am trying to use Mimic for a mod in a game, but the game engine locks ALSA so that I cannot utilize it without outputting the sound to a file then playing it.

If Mimic where to use Pulse then it would completely circumvent this issue and others like it.