[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
Resolution:           |   Keywords:
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Comment (by Paul Ramsey <pramsey@…>):

 In [changeset:"f02a7536cb3597d2db400fdd0e4747f03e29b6e2/git" f02a753/git]:
 {{{#!CommitTicketReference repository="git"
 revision="f02a7536cb3597d2db400fdd0e4747f03e29b6e2"
 Catch all FALLTHROUGH cases in a standard way,
 move to strict K&R style prototypes for functions
 with no arguments, cleans up warnings in recent compilers
 References #6069
 }}}
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/6069#comment:1>
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