[PostGIS] #6064: Silent topology corruption with topology.ST_AddEdgeModFace

[PostGIS]

#6064: Silent topology corruption with topology.ST_AddEdgeModFace
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  Reporter:  strk      |      Owner:  strk
      Type:  defect    |     Status:  new
  Priority:  medium    |  Milestone:
 Component:  topology  |    Version:  master
Resolution:            |   Keywords:  robustness
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Comment (by strk):

 Using a `long double` instead of a `double` in the signed-area function
 fixes this case, making `ptarray_isccw` more robust.
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/6064#comment:9>
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