[PostGIS] #5784: Export circ_tree_distance_tree_internal and use memset instead of bzero

[PostGIS]

#5784: Export circ_tree_distance_tree_internal and use memset  instead of bzero
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  Reporter:  mschoema   |      Owner:  robe
      Type:  patch      |     Status:  new
  Priority:  medium     |  Milestone:  PostGIS 3.6.0
 Component:  liblwgeom  |    Version:  master
Resolution:             |   Keywords:
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Changes (by robe):

 * owner:  strk => robe

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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5784#comment:3>
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