pulse: replace obsolete string pulse_async (makes baresip PipeWire compatible)

[cspiel1]

Yesterday I replaced pulseaudio daemon with WirePlumber / Pipewire on my dev host. The plan was too use pipewire-pulse.service which makes pipewire compatible to pulseaudio clients like baresip with module pulse.

With command /play ring.wav didn't hear anything. Also no error messages.

The reason for this seems to be this faulty registration with the obsolete key pulse_async.

        err  = auplay_register(&auplay, baresip_auplayl(),
                              "pulse_async", pulse_async_player_alloc);
        err |= ausrc_register(&ausrc, baresip_ausrcl(),
                             "pulse_async", pulse_async_recorder_alloc);

Replacing pulse_async by pulse solves the problem.

[sreimers]

Can you rebase against main? I fixed the flaky azure mirrors #2413