tests/run-tests: Consider all tests as native when emit=native is used.
tests/run-tests: Consider all tests as native when emit=native is used.

So that they are skipped when running on a target that doesn't support the
native emitter, eg a nanbox build.

pozetroninc/micropython,selste/micropython,tobbad/micropython,adafruit/circuitpython,tobbad/micropython,pozetroninc/micropython,pramasoul/micropython,bvernoux/micropython,adafruit/circuitpython,pramasoul/micropython,adafruit/circuitpython,selste/micropython,adafruit/circuitpython,MrSurly/micropython,pramasoul/micropython,pozetroninc/micropython,tobbad/micropython,henriknelson/micropython,kerneltask/micropython,bvernoux/micropython,kerneltask/micropython,MrSurly/micropython,adafruit/circuitpython,bvernoux/micropython,adafruit/circuitpython,MrSurly/micropython,pozetroninc/micropython,selste/micropython,MrSurly/micropython,bvernoux/micropython,pramasoul/micropython,pozetroninc/micropython,kerneltask/micropython,tobbad/micropython,selste/micropython,henriknelson/micropython,henriknelson/micropython,kerneltask/micropython,kerneltask/micropython,henriknelson/micropython,henriknelson/micropython,pramasoul/micropython,MrSurly/micropython,tobbad/micropython,bvernoux/micropython,selste/micropython