Winsock: Use Per-Thread Buffers Instead of Per-Process Buffers

[Robert Shearman]

Hi,

According to MSDN, gethostbyname, getservbyname, etc. should all return 
a buffer that is allocated once per thread. This patch does this and 
consequently makes the functions thread-safe.

Rob

Changelog:
Convert per-process hostent, servent and protent buffers into per-thread 
buffers.
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