[PostGIS] #5753: PostgreSQL v17 has branched, so 7e62e02ba0 has become obsolete

[PostGIS]

#5753: PostgreSQL v17 has branched, so 7e62e02ba0 has become obsolete
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 Reporter:  Laurenz Albe  |      Owner:  pramsey
     Type:  defect        |     Status:  new
 Priority:  low           |  Milestone:  PostGIS 3.4.3
Component:  postgis       |    Version:  3.4.x
 Keywords:  JSON v18      |
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 `POSTGIS_PGSQL_VERSION` is 180 now that PostgreSQL v17 has branched, so
 building PostGIS with PostgreSQL head fails.

 We need a patch like the attached.

 I briefly looked at this, and there is some code duplication with
 PostgreSQL (`JsonTypeCategory`, `datum_to_json`, ...).  Is the reason
 backward compatibility for building with older PostgreSQL versions?
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5753>
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