[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):

 I'm hitting the same problem.

 I think the right fix would be to get rid of `coreIntHandler`:
 `_PG_fini()` could simply be removed (it is never called from PostgreSQL),
 and `handleInterrupt(int)` can just skip calling the previous interrupt
 handler.
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5839#comment:2>
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