tools/makemanifest.py: Skip freezing unsupported files with warning.
tools/makemanifest.py: Skip freezing unsupported files with warning.

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