AP_HAL_Linux: SITL: add missing header for timeval struct on alpine l… #678

Job	Run time
build (stm32f7, chibios, 10)	1s
build (stm32h7, chibios, 10)	1s
build (fmuv2-plane, chibios, 10)	7m 40s
build (periph-build, chibios, 10)	4m 53s
build (iofirmware, chibios, 10)	4m 27s
build (CubeOrange-bootloader, chibios, 10)	3m 23s
build (fmuv3-bootloader, chibios, 10)	3m 24s
build (revo-bootloader, chibios, 10)	6s
build (stm32h7-debug, chibios, 10)	1s
build (fmuv3, chibios, 10)	8m 24s
build (revo-mini, chibios, 10)	1s
build (MatekF405-Wing, chibios, 10)	4m 56s
build (CubeOrange-ODID, chibios, 10)	8m 23s
build (CubeRedPrimary-bootloader, chibios, 10)	3m 24s
build (configure-all, chibios, 10)	8m 24s
build (build-options-defaults-test, chibios, 10)	8m 26s
build (signing, chibios, 10)	1s
build (CubeOrange-PPP, chibios, 10)	8m 29s
build (SOHW, chibios, 10)	1s
build (Pixhawk6X-PPPGW, chibios, 10)	2m 33s
build (new-check, chibios, 10)	4m 56s
	1h 21m 54s

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