bench test uses a semaphore instead of flags+sleep #520

Job	Run time
build-firmware (hellen72, config/boards/hellen/hellen72, fome_hellen72.ini)	1m 16s
build-firmware (alphax-2chan, config/boards/hellen/alphax-2chan, fome_alphax-2chan.ini)	1m 20s
build-firmware (alphax-4chan, config/boards/hellen/alphax-4chan, fome_alphax-4chan.ini)	1m 17s
build-firmware (alphax-8chan, config/boards/hellen/alphax-8chan, fome_alphax-8chan.ini)	1m 14s
build-firmware (hellen-nb1, config/boards/hellen/hellen-nb1, fome_hellen-nb1.ini)	1m 18s
build-firmware (hellenNA8_96, config/boards/hellen/hellenNA8_96, fome_hellenNA8_96.ini)	1m 16s
build-firmware (hellenNA6, config/boards/hellen/hellen64_miataNA6_94, fome_hellenNA6.ini)	1m 15s
build-firmware (hellen154hyundai, config/boards/hellen/hellen154hyundai, fome_hellen154hyundai.ini)	1m 14s
build-firmware (mre_f4, config/boards/microrusefi, fome_mre_f4.ini)	1m 23s
build-firmware (mre_f7, config/boards/microrusefi, fome_mre_f7.ini)	1m 16s
build-firmware (proteus_f4, config/boards/proteus, fome_proteus_f4.ini)	1m 23s
build-firmware (proteus_f7, config/boards/proteus, fome_proteus_f7.ini)	1m 25s
build-firmware (proteus_h7, config/boards/proteus, fome_proteus_h7.ini)	1m 25s
build-firmware (stm32f429_nucleo, config/boards/nucleo_f429, fome_stm32f429_nucleo.ini)	1m 14s
build-firmware (f407-discovery, config/boards/f407-discovery, fome_f407-discovery.ini)	1m 16s
	19m 32s

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