[PostGIS] #6065: ValidateTopology fails to report invalid side-labeling

[PostGIS]

#6065: ValidateTopology fails to report invalid side-labeling
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  Reporter:  strk      |      Owner:  strk
      Type:  defect    |     Status:  new
  Priority:  medium    |  Milestone:  PostGIS 3.7.0
 Component:  topology  |    Version:  master
Resolution:            |   Keywords:
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Comment (by strk):

 Using a `long double` instead of a `double` in the signed-area function
 fixes this case, making ST_IsPolygonCCW more robust.
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/6065#comment:3>
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