[PostGIS] #5839: Does not comile with postgres 18

[PostGIS]

#5839: Does not comile with postgres 18
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  Reporter:  RekGRpth  |      Owner:  pramsey
      Type:  defect    |     Status:  new
  Priority:  medium    |  Milestone:  PostGIS 3.5.3
 Component:  postgis   |    Version:  master
Resolution:            |   Keywords:
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Comment (by laurenz):

 The same applies to `sfcgal/lwgeom_sfcgal.c` and
 `raster/rt_pg/rtpostgis.c`.
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5839#comment:3>
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