[PostGIS] #6058: Pg19 Build Support

[PostGIS]

#6058: Pg19 Build Support
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 Reporter:  pramsey  |      Owner:  pramsey
     Type:  defect   |     Status:  new
 Priority:  medium   |  Milestone:  PostGIS 3.5.6
Component:  postgis  |    Version:  master
 Keywords:           |
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 The formerly private composite_to_json() in Postgres has been exposed
 externally so we can make use of it in Pg19+
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/6058>
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