mpy-cross: Enable more warnings.
mpy-cross: Enable more warnings.

adafruit/circuitpython,bvernoux/micropython,henriknelson/micropython,MrSurly/micropython,bvernoux/micropython,MrSurly/micropython,adafruit/circuitpython,MrSurly/micropython,adafruit/circuitpython,MrSurly/micropython,henriknelson/micropython,henriknelson/micropython,MrSurly/micropython,henriknelson/micropython,henriknelson/micropython,adafruit/circuitpython,adafruit/circuitpython,bvernoux/micropython,adafruit/circuitpython,bvernoux/micropython,bvernoux/micropython