busybox: add IPv6 support #270

Job	Run time
call-ci / build (armv7a7-imx6ull-evk)	1m 26s
call-ci / build (armv7a9-zynq7000-qemu)	1m 31s
call-ci / build (armv7a9-zynq7000-zedboard)	1m 27s
call-ci / build (armv7a9-zynq7000-zturn)	1m 27s
call-ci / build (armv7m4-stm32l4x6-nucleo)	1m 6s
call-ci / build (armv7m7-imxrt105x-evk)	1m 20s
call-ci / build (armv7m7-imxrt106x-evk)	1m 18s
call-ci / build (armv7m7-imxrt117x-evk)	1m 14s
call-ci / build (host-generic-pc)	58s
call-ci / build (ia32-generic-pc)	1m 28s
call-ci / build (ia32-generic-qemu)	1m 28s
call-ci / build (riscv64-generic-qemu)	1m 0s
call-ci / build (riscv64-generic-spike)	1m 6s
call-ci / build (sparcv8leon3-gr716-mini)	58s
call-ci / test HW	0s
call-ci / test EMU	0s
call-ci / tests-summary	14s
call-ci / send-notification	0s
	18m 1s

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