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Add an implementation for Plan 9. The unit test passes with IPv4 and
IPv6.

remove full iface access assumption [linux/bsd]

linux/bsd
fix #8

chore: update sockaddr to fix build

Our CircleCI scripts check builds on a ton of platforms and have better linting.

fix: compile on bsd

go treats _goos suffixes as build tags. Use a non-platform suffix so this builds
on all supported platforms.

Revert "chore: switch to circleci"

chore: switch to circleci

Our CircleCI scripts check builds on a ton of platforms and have better linting.

remove syscall dep from windows