ws2_32: Declare gethostname in winsock.h

[Kai Blin]

This makes the sock.c test compile with msvc again.
---
 dlls/ws2_32/tests/sock.c |    5 -----
 include/winsock.h        |    2 +-
 2 files changed, 1 insertions(+), 6 deletions(-)
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