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