Jeff Epler 47d6dd843e audioio: By default, be compatible with 4.x
Testing performed: That the shipped .mpy files on a PyPortal (CP 4.x)
still work (play audio) with this branch, instead of erroring because
`WaveFile` can't be found in `audioio`.

Flash usage grew by 28 bytes.  (I expected 24, there must be some other
effect on size/alignment that I didn't predict)
2019-08-17 13:54:06 -05:00
..
2019-07-25 06:44:26 -05:00