Add --audio-output-buffer

On some systems, the SDL audio callback is not called frequently enough
(for example it requests 5ms of samples every 10ms), because the output
buffer is too small.

By default, we want to use a small value (5ms) to minimize latency and
buffer underrun, but if it does not work well, users need a way to
increase it.

Refs #3793 <https://github.com/Genymobile/scrcpy/issues/3793>

app/src/options.h

@@ -127,6 +127,7 @@ struct scrcpy_options {
     sc_tick display_buffer;
     sc_tick v4l2_buffer;
     sc_tick audio_buffer;
+    sc_tick audio_output_buffer;
 #ifdef HAVE_USB
     bool otg;
 #endif