Change IO::Socket::INET.get to return undef on EOF, matching IO semantics.
Also make sure that the line separator is encoded correctly.

Now, if only someone could show me a good way to make the transcoding happen
at attribute assignment and not at every readline call...
Fix IO::Socket::INET.lines - now with actual looping
Merge branch 'fix-socket-get-2' of https://github.com/gerdr/rakudo into nom