ws2_32: Add tests and implement inet_pton

[Marvin]

Hi,

While running your changed tests on Windows, I think I found new failures.
Being a bot and all I'm not very good at pattern recognition, so I might be
wrong, but could you please double-check?
Full results can be found at
https://testbot.winehq.org/JobDetails.pl?Key=9974

Your paranoid android.


=== wxppro (32 bit sock) ===
sock.c:610: Test failed: oob_server (184): unexpectedly at the OOB mark: 0