Add missing include guard to win32ntdll.h.

Thomas Munro <tmunro@postgresql.org>

Commit: af9e6331aeba149c93052c3549140082a85a3cf9
Author: Thomas Munro <tmunro@postgresql.org>
Date: 2022-01-11T21:19:00Z
Releases: 15.0
Add missing include guard to win32ntdll.h.

Oversight in commit e2f0f8ed.  Also add this file to the exclusion lists
in headerscheck and cpluscpluscheck, because Unix systems don't have a
header it includes.

Reported-by: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: https://postgr.es/m/2760528.1641929756%40sss.pgh.pa.us

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Cited messages not in the archive: 2760528.1641929756@sss.pgh.pa.us