Add --enable-overrid option #74

Job	Run time
build (stm32f7, chibios, 6)	15m 12s
build (stm32f7, chibios, 10)	15m 18s
build (stm32h7, chibios, 6)	12m 47s
build (stm32h7, chibios, 10)	12m 16s
build (fmuv2-plane, chibios, 10)	4m 53s
build (periph-build, chibios, 10)	19m 14s
build (iofirmware, chibios, 6)	3m 40s
build (iofirmware, chibios, 10)	3m 32s
build (CubeOrange-bootloader, chibios, 6)	3m 22s
build (CubeOrange-bootloader, chibios, 10)	3m 18s
build (fmuv3-bootloader, chibios, 10)	58s
build (revo-bootloader, chibios, 6)	3m 14s
build (revo-bootloader, chibios, 10)	3m 12s
build (stm32h7-debug, chibios, 6)	8m 32s
build (stm32h7-debug, chibios, 10)	8m 30s
build (fmuv3, chibios, 6)	13m 36s
build (fmuv3, chibios, 10)	13m 35s
build (revo-mini, chibios, 10)	11m 55s
build (MatekF405-Wing, chibios, 10)	12m 17s
build (CubeOrange-ODID, chibios, 10)	9m 19s
build (configure-all, chibios, 6)	10m 27s
build (configure-all, chibios, 10)	10m 15s
build (build-options-defaults-test, chibios, 6)	20m 48s
build (build-options-defaults-test, chibios, 10)	20m 58s
build (signing, chibios, 10)	5m 50s
build (stm32h7, chibios-py2)	12m 17s
	4h 19m 15s

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