esp8266/uart: Allow to compile with event-driven REPL.
esp8266/uart: Allow to compile with event-driven REPL.

tobbad/micropython,pozetroninc/micropython,pramasoul/micropython,kerneltask/micropython,ryannathans/micropython,adafruit/micropython,adafruit/micropython,MrSurly/micropython,swegener/micropython,selste/micropython,adafruit/circuitpython,ryannathans/micropython,bvernoux/micropython,pfalcon/micropython,pozetroninc/micropython,bvernoux/micropython,tralamazza/micropython,selste/micropython,trezor/micropython,pozetroninc/micropython,pramasoul/micropython,ryannathans/micropython,tobbad/micropython,bvernoux/micropython,swegener/micropython,selste/micropython,adafruit/micropython,dmazzella/micropython,trezor/micropython,tobbad/micropython,bvernoux/micropython,pfalcon/micropython,henriknelson/micropython,dmazzella/micropython,swegener/micropython,adafruit/circuitpython,tralamazza/micropython,adafruit/micropython,adafruit/circuitpython,MrSurly/micropython,adafruit/micropython,dmazzella/micropython,selste/micropython,kerneltask/micropython,swegener/micropython,pramasoul/micropython,bvernoux/micropython,tralamazza/micropython,henriknelson/micropython,tralamazza/micropython,ryannathans/micropython,adafruit/circuitpython,pramasoul/micropython,swegener/micropython,henriknelson/micropython,adafruit/circuitpython,pozetroninc/micropython,pfalcon/micropython,kerneltask/micropython,ryannathans/micropython,pramasoul/micropython,pfalcon/micropython,MrSurly/micropython,trezor/micropython,kerneltask/micropython,trezor/micropython,selste/micropython,pozetroninc/micropython,pfalcon/micropython,MrSurly/micropython,henriknelson/micropython,tobbad/micropython,kerneltask/micropython,tobbad/micropython,henriknelson/micropython,dmazzella/micropython,MrSurly/micropython,adafruit/circuitpython,trezor/micropython