[PostGIS] #6003: unknown conversion warning in lwgeom under mingw64/msys2 gcc 13.2

[PostGIS]

#6003: unknown conversion warning in lwgeom under mingw64/msys2 gcc 13.2
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  Reporter:  robe     |      Owner:  pramsey
      Type:  defect   |     Status:  new
  Priority:  low      |  Milestone:  PostGIS 3.6.1
 Component:  postgis  |    Version:  3.5.x
Resolution:           |   Keywords:  windows
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Comment (by robe):

 This seems to be a common issue with mingw64.

 So other references to the issue in other projects

 such as in QT- https://bugreports.qt.io/browse/QTBUG-70030

 VHDL compiler and simulator -- https://github.com/nickg/nvc/issues/525

 The suggestion is it has to do with msvcrt which is pegged at c89 or some
 such thing
 and can be worked around by forcing __USE_MINGW_ANSI_STDIO 1.

 I haven't given that a try to see if it resolves the issue.
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/6003#comment:1>
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