Build

Merge pull request #339 from yosinski/master #406

Job	Run time
build (metro_m0)	1m 35s
build (hallowing)	1m 51s
build (circuitplayground_m0)	1m 51s
build (metro_m4)	1m 37s
build (pybadge_m4)	1m 32s
build (pygamer_m4)	1m 34s
build (hallowing_m4)	1m 46s
build (pyportal_m4)	1m 33s
build (pyportal_m4_titano)	1m 54s
build (feather_m4_can)	1m 37s
build (metro_m0:usbstack=tinyusb)	5m 12s
build (metro_m4:speed=120,usbstack=tinyusb)	5m 49s
	27m 51s

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