1-line fix to port/thread.c for compiling libpq with Borland C

Patch applied. Seem that was the only missing place. Backpatched to
7.4.X.

---------------------------------------------------------------------------

L J Bayuk wrote:

Below please find a tiny patch to PostgreSQL-7.4.1 src/port/thread.c that I
found was necessary to compile libpq on Windows using Borland C++ Builder.
The patch causes the the WIN32 code to be included, and <pwd.h> skipped, if
under either WIN32 compiler, rather than just with MSVC.
(Alternative is to just use "#if defined(WIN32)", which works for me, but
I don't know if that would be safe.)

*** src/port/thread.c.orig	Mon Nov 24 08:11:27 2003
--- src/port/thread.c	Tue Feb 24 19:19:35 2004
***************
*** 16,22 ****

#include <sys/types.h>
#include <errno.h>
! #if defined(WIN32) && defined(_MSC_VER)
#undef ERROR
#else
#include <pwd.h>
--- 16,22 ----

#include <sys/types.h>
#include <errno.h>
! #if defined(WIN32) && (defined(_MSC_VER) || defined(__BORLANDC__))
#undef ERROR
#else
#include <pwd.h>

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