libpq: use pgsocket for socket values, for portability

Bruce Momjian <bruce@momjian.us>

Commit: 5d305d86bd917723f09ab4f15c075d90586a210a
Author: Bruce Momjian <bruce@momjian.us>
Date: 2014-04-16T23:46:51Z
Releases: 9.4.0
libpq:  use pgsocket for socket values, for portability

Previously, 'int' was used for socket values in libpq, but socket values
are unsigned on Windows.  This is a style correction.

Initial patch and previous PGINVALID_SOCKET initial patch by Joel
Jacobson, modified by me

Report from PVS-Studio

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