Add --enable-overrid option #75

Job	Run time
build (stm32f7, chibios, 6)	15m 1s
build (stm32f7, chibios, 10)	15m 38s
build (stm32h7, chibios, 6)	12m 25s
build (stm32h7, chibios, 10)	12m 35s
build (fmuv2-plane, chibios, 10)	4m 53s
build (periph-build, chibios, 10)	19m 52s
build (iofirmware, chibios, 6)	3m 40s
build (iofirmware, chibios, 10)	3m 42s
build (CubeOrange-bootloader, chibios, 6)	3m 17s
build (CubeOrange-bootloader, chibios, 10)	3m 13s
build (fmuv3-bootloader, chibios, 10)	1m 7s
build (revo-bootloader, chibios, 6)	3m 39s
build (revo-bootloader, chibios, 10)	3m 23s
build (stm32h7-debug, chibios, 6)	8m 10s
build (stm32h7-debug, chibios, 10)	8m 7s
build (fmuv3, chibios, 6)	13m 36s
build (fmuv3, chibios, 10)	13m 40s
build (revo-mini, chibios, 10)	12m 2s
build (MatekF405-Wing, chibios, 10)	12m 9s
build (CubeOrange-ODID, chibios, 10)	9m 27s
build (configure-all, chibios, 6)	10m 5s
build (configure-all, chibios, 10)	10m 6s
build (build-options-defaults-test, chibios, 6)	21m 38s
build (build-options-defaults-test, chibios, 10)	20m 43s
build (signing, chibios, 10)	6m 3s
build (stm32h7, chibios-py2)	12m 16s
	4h 20m 27s

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