[PostGIS] #5851: pg18 support

[PostGIS]

#5851: pg18 support
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  Reporter:  RekGRpth  |      Owner:  pramsey
      Type:  defect    |     Status:  new
  Priority:  medium    |  Milestone:  PostGIS 3.5.3
 Component:  postgis   |    Version:  master
Resolution:            |   Keywords:
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Comment (by Laurenz Albe):

 I stumbled over the same problem.
 Attached is a simple patch that should take care of the problem.
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5851#comment:1>
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