[PostGIS] #5841: Pg18 changes pqsignal() return

[PostGIS]

#5841: Pg18 changes pqsignal() return
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 Reporter:  pramsey  |      Owner:  pramsey
     Type:  defect   |     Status:  new
 Priority:  medium   |  Milestone:  PostGIS 3.6.0
Component:  postgis  |    Version:  master
 Keywords:           |
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 And this in turn breaks our build. Consultation with pgsql-hackers
 indicates that we've been Doing It Wrong all along.

 https://www.postgresql.org/message-
 id/flat/4E796D56-79B5-4447-9DA7-5428BC1A6B53%40cleverelephant.ca
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5841>
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