AP_Logger: don't virtual out_of_time_for_writing_messages for DF #615

Job	Run time
build (stm32f7, chibios, 10)	19m 14s
build (stm32h7, chibios, 10)	25m 14s
build (fmuv2-plane, chibios, 10)	7m 28s
build (periph-build, chibios, 10)	26m 3s
build (iofirmware, chibios, 10)	3m 14s
build (CubeOrange-bootloader, chibios, 10)	1m 41s
build (fmuv3-bootloader, chibios, 10)	1m 58s
build (revo-bootloader, chibios, 10)	1m 59s
build (stm32h7-debug, chibios, 10)	13m 8s
build (fmuv3, chibios, 10)	17m 13s
build (revo-mini, chibios, 10)	14m 0s
build (MatekF405-Wing, chibios, 10)	14m 22s
build (CubeOrange-ODID, chibios, 10)	10m 32s
build (CubeRedPrimary-bootloader, chibios, 10)	2m 5s
build (configure-all, chibios, 10)	13m 36s
build (build-options-defaults-test, chibios, 10)	37m 1s
build (signing, chibios, 10)	15m 18s
	3h 44m 6s

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