Derive default audio driver from default audio device #1009
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Modern Linux distributions often prefer PulseAudio over ALSA, thus their default audio driver should be "pulse" rather "alsa"; derive the default audio driver from the default audio device, which can already be changed by using e.g.
-DDEFAULT_AUDIO_DEVICE=\"pulse\"
in$EXTRA_CFLAGS
.It completes the approach taken by #994 and #1001 and avoids for downstreams the need to batch baresip just to change the default.