Add --require-audio

By default, scrcpy mirrors only the video when audio capture fails on
the device. Add an option to force scrcpy to fail if audio is enabled
but does not work.

PR #3757 <https://github.com/Genymobile/scrcpy/pull/3757>

app/src/options.h

@@ -154,6 +154,7 @@ struct scrcpy_options {
     bool start_fps_counter;
     bool power_on;
     bool audio;
+    bool require_audio;
     bool list_encoders;
     bool list_displays;
 };