close() vs. closesocket()

Looking at libpq, you can see Win32 requires closesocket() while Unix
uses just uses close().

I have to add this type of change to the backend for Win32, so I am
inclined to make all the socket close calls closesocket() and #define
that as close() on Unix?  It would remove quite a few Win32 defs from
libpq too.

Comments?

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