[PostGIS] #6127: PostgreSQL 20 doesn't work against 3.7.0

[PostGIS]

#6127: PostgreSQL 20 doesn't work against 3.7.0
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  Reporter:  robe     |      Owner:  pramsey
      Type:  defect   |     Status:  new
  Priority:  medium   |  Milestone:  PostGIS 3.7.1
 Component:  postgis  |    Version:  master
Resolution:           |   Keywords:
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Comment (by Laurenz Albe):

 I have attached a patch to fix the build error.
 It should at least be applied to the master branch.
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/6127#comment:1>
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