ws2_32/tests: Add tests for getsockopt() with SO_SNDBUF and SO_RCVBUF optname.

[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=20513

Your paranoid android.


=== w7pro64 (32 bit sock) ===
sock.c:7750: Test failed: bytesReturned isn't supposed to be 1
sock.c:7774: Test failed: GetOverlappedResult failed, error 0