[PostGIS] #6069: Build failure on 3.6 CI latest

[PostGIS]

#6069: Build failure on 3.6 CI latest
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 Reporter:  pramsey  |      Owner:  pramsey
     Type:  defect   |     Status:  assigned
 Priority:  medium   |  Milestone:  PostGIS 3.6.3
Component:  postgis  |    Version:  3.6.x
 Keywords:           |
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 But puke of complaints about incorrect prototypes and un-tagged
 fallthrough cases.
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/6069>
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