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Otherwise, we're casting from a smaller type to a bigger type,
addressing memory that's not ours.

fixes #19

1. Switch back to the syscall package for errors. That way, we get consistent
   errors on all platforms.
2. Use `sys/windows` where appropriate.
3. Export type aliases for the *Sockaddr* types. That way, we can use the
   platform-specific types but call them the same name, regardless of platform.

syscall is frozen and mostly deprecated.