pgsql: Partially revert commit 536d47bd9d5fce8d91929bee3128fa1d08dbcc57

Partially revert commit 536d47bd9d5fce8d91929bee3128fa1d08dbcc57.

Per buildfarm, the "#ifdef F_SETFD" removed in that commit actually
is needed on Windows, because fcntl() isn't available at all on that
platform, unless using Cygwin. We could perhaps spell it more like
"#ifdef HAVE_FCNTL", or "#ifndef WIN32", but it's not clear that
those choices are better.

It does seem that we don't need the bogus manual definition of
FD_CLOEXEC, though, so keep that change.

Discussion: /messages/by-id/26254.1492805635@sss.pgh.pa.us

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/5041cdf2b79216b10ca90498d9a9b8fd4abf1745

Modified Files
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src/interfaces/libpq/fe-connect.c | 2 ++
1 file changed, 2 insertions(+)

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