Renamed APIs:
 * mal_sine_wave_read()    -> mal_sine_wave_read_f32()
 * mal_sine_wave_read_ex() -> mal_sine_wave_read_f32_ex()

Renamed APIs:
 * mal_decoder_read()          -> mal_decoder_read_pcm_frames()
 * mal_decoder_seek_to_frame() -> mal_decoder_seek_to_pcm_frame()

This backend is the new priority backend for Android.

This makes it more convenient to test because it avoids the need for
the use of emrun.

This change makes it consistent with iOS.

This test will be replaced later with something better.