windows: msvc: Define STDIN/OUT/ERR_FILENO.

This commit (c290e79cf0) was originally back-patched to v15.
Commit 97550c0711 added a new use of STDERR_FILENO, and it was
back-patched all the way to v11, thus breaking MSVC builds for v11
through v14.  Since STDERR_FILENO is now needed on older versions,
let's back-patch c290e79cf0 down to v11, too.

Here follows the original commit message describing the change:

Because they are not available we've used _fileno(stdin) in some places, but
that doesn't reliably work, because stdin might be closed. This is the
prerequisite of the subsequent commit, fixing a failure introduced in
76e38b37a5.

Author: Andres Freund <and...@anarazel.de>
Reported-By: Sandeep Thakkar <sandeep.thak...@enterprisedb.com>
Message-Id: 20220520164558.ozb7lm6unakqz...@alap3.anarazel.de (on 
pgsql-packagers)
Discussion: https://postgr.es/m/20231017164517.GA613565%40nathanxps13
Backpatch-through: 11

Branch
------
REL_13_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/ebc093fa6481935bfd0ead8d47c8831a1bcf3536

Modified Files
--------------
src/include/port/win32_msvc/unistd.h | 8 ++++++++
1 file changed, 8 insertions(+)

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