Make Mac build generate audio
Make Mac build generate audio

The initialization of SynthUnit changed (a long time ago), but the Mac
app was never updated. Note, the Mac app probably still needs
hand-editing so it can find the ROM file, and maybe also the MIDI
device.

google/music-synthesizer-for-android,google/music-synthesizer-for-android,raphlinus/music-synthesizer-for-android,raphlinus/music-synthesizer-for-android,raphlinus/music-synthesizer-for-android,google/music-synthesizer-for-android,raphlinus/music-synthesizer-for-android,google/music-synthesizer-for-android,google/music-synthesizer-for-android