[PostGIS] #6067: MacOS CI and winnie failing on topology topogeo_addlinestring, validatetopology

[PostGIS]

#6067: MacOS CI and winnie failing on topology topogeo_addlinestring,
validatetopology
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  Reporter:  robe      |      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):

 Good news: it was a bug in my dangling-skip implementation. Seems to work
 now, including without long-double. I'll cleanup and merge today.
 !LineMerge was good, given the inputs (but yes, it can return non-simple
 components if inputs were non-simple)
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/6067#comment:11>
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