hide same unused field #18

Job	Run time
build-unit-tests (mazduino-mega100-512)	1m 1s
build-unit-tests (mazduino-lite)	45s
build-unit-tests (mazduino-mini6ch)	44s
build-unit-tests (mazduino-mega100)	45s
build-unit-tests (mazduino-compact)	1m 6s
	4m 21s

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