Aio defer #2493

Job	Run time
build (mbed, libmbedtls-dev, build.mbed, auto)	4m 3s
build (mbed, libmbedtls-dev, build.mbed, auto)	4m 3s
build (mbed, libmbedtls-dev, build.mbed, auto)	4m 3s
build (mbed, libmbedtls-dev, build.mbed, epoll)	3m 57s
build (mbed, libmbedtls-dev, build.mbed, epoll)	4m 0s
build (mbed, libmbedtls-dev, build.mbed, epoll)	4m 0s
build (mbed, libmbedtls-dev, build.mbed, select)	4m 2s
build (mbed, libmbedtls-dev, build.mbed, select)	4m 6s
build (mbed, libmbedtls-dev, build.mbed, select)	3m 58s
build (mbed, libmbedtls-dev, build.mbed, poll)	4m 0s
build (mbed, libmbedtls-dev, build.mbed, poll)	3m 58s
build (mbed, libmbedtls-dev, build.mbed, poll)	3m 58s
build (wolf, libwolfssl-dev, build.wolf, auto)	3m 49s
build (wolf, libwolfssl-dev, build.wolf, auto)	3m 59s
build (wolf, libwolfssl-dev, build.wolf, auto)	4m 6s
build (wolf, libwolfssl-dev, build.wolf, epoll)	3m 58s
build (wolf, libwolfssl-dev, build.wolf, epoll)	3m 57s
build (wolf, libwolfssl-dev, build.wolf, epoll)	3m 57s
build (wolf, libwolfssl-dev, build.wolf, select)	4m 1s
build (wolf, libwolfssl-dev, build.wolf, select)	4m 3s
build (wolf, libwolfssl-dev, build.wolf, select)	4m 27s
build (wolf, libwolfssl-dev, build.wolf, poll)	3m 56s
build (wolf, libwolfssl-dev, build.wolf, poll)	4m 3s
build (wolf, libwolfssl-dev, build.wolf, poll)	4m 2s
	1h 36m 26s

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