Use `ip -6 addr` command for setting ipv6 addr on linux. #1430

Job	Run time
build-ios (aarch64-apple-ios)	3m 4s
clippy-check-ios (aarch64-apple-ios)	1m 33s
build-ios (aarch64-apple-ios-sim)	2m 49s
clippy-check-ios (aarch64-apple-ios-sim)	1m 14s
	8m 40s

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