Fix elog(FATAL) before PostmasterMain() or just after fork().

Noah Misch <noah@leadboat.com>

Commit: 8b9cbf4922756d912309567f83f81e41f1737ac7
Author: Noah Misch <noah@leadboat.com>
Date: 2024-12-10T21:51:59Z
Releases: 18.0
Fix elog(FATAL) before PostmasterMain() or just after fork().

Since commit 97550c0711972a9856b5db751539bbaf2f88884c, these failed with
"PANIC:  proc_exit() called in child process" due to uninitialized or
stale MyProcPid.  That was reachable if close() failed in
ClosePostmasterPorts() or setlocale(category, "C") failed, both
unlikely.  Back-patch to v13 (all supported versions).

Discussion: https://postgr.es/m/20241208034614.45.nmisch@google.com

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