convert libpgport's pqsignal() to a void function

When Who What
2025-01-17 02:57:37 Nathan Bossart (bossartn) Closed in commitfest 2025-03 with status: Committed
2025-01-17 02:57:37 Nathan Bossart (bossartn) Changed committer to bossartn
2025-01-15 02:46:10 Nathan Bossart (bossartn) Changed authors to Nathan Bossart (bossartn)
2025-01-15 02:46:10 Nathan Bossart (bossartn) Changed targetversion to 18
2025-01-15 02:46:05 Nathan Bossart (bossartn) Attached mail thread Z4chOKfnthRH71mw@nathan
2025-01-15 02:46:05 Nathan Bossart (bossartn) Created patch record