ws2_32: Handle gethostbyname call failure, add tests.

[Kai Blin]

Fixes bug 12837, thanks to Hans Leidekker for the catch.

This also adds some tests for the WS_gethostbyname localhost workaround.
---
 dlls/ws2_32/socket.c     |    2 +-
 dlls/ws2_32/tests/sock.c |   68 
++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 69 insertions(+), 1 deletions(-)
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