[PostGIS] #5757: pgSQL 17 json support prevents compile

[PostGIS]

#5757: pgSQL 17 json support prevents compile
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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):

 * status:  new => closed
 * resolution:   => invalid

Comment:

 Okay this could be a false alarm., they flipped master to PG18 which has
 the new SQL JSON so I was testing against PG18 and debbie is also testing
 against PG18 and I think I had set the IFDEF to take effect at PG18 so
 they probably haven't flipped things yet.

 I'll reopen if after I retest against the real PG17 it still fails.
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5757#comment:3>
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