[PostGIS] #5757: pgSQL 18 failing compile on JSON (was: pgSQL 17 json support prevents compile)

[PostGIS]

#5757: pgSQL 18 failing compile on JSON
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  Reporter:  robe     |      Owner:  robe
      Type:  defect   |     Status:  closed
  Priority:  blocker  |  Milestone:  PostGIS 3.5.0
 Component:  postgis  |    Version:  3.4.x
Resolution:  invalid  |   Keywords:
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Changes (by robe):

 * summary:  pgSQL 17 json support prevents compile => pgSQL 18 failing
     compile on JSON

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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5757#comment:4>
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