[PostGIS] #5698: XX000: SQL/MM Spatial exception - point not on edge

[PostGIS]

#5698: XX000: SQL/MM Spatial exception - point not on edge
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  Reporter:  Lars Aksel Opsahl  |      Owner:  strk
      Type:  defect             |     Status:  new
  Priority:  medium             |  Milestone:  PostGIS 3.4.3
 Component:  topology           |    Version:  3.4.x
Resolution:                     |   Keywords:
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Comment (by strk):

 The problem ends up being in `lwline_split_by_point_to` using `p4_same` to
 check if two points are IDENTICAL while that function uses `FP_EQUALS`
 macro, for some reason I fail to understand at this moment.

 We have two paths here: STOP using `p4_same` as known to be using fuzzy
 equality or fix `p4_same` and friends to stop doing that.
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5698#comment:10>
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