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ListInterfaces copied from Linux; Fuchsia's fdio implements getifaddrs since https://fuchsia.googlesource.com/fuchsia/+/a8b1df8. Change-Id: I6fa03dfa8a446551e4fa1ad3c0309ad51bb93310 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/159220 Reviewed-by: Zach Anderson <zra@google.com> Commit-Queue: Zach Anderson <zra@google.com>