[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:  strk
     Type:  patch      |     Status:  new
 Priority:  medium     |  Milestone:  PostGIS 3.6.0
Component:  liblwgeom  |    Version:  master
 Keywords:             |
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 In MobilityDB we embed liblwgeom to efficiently process PostGIS types.
 To update liblwgeom versions, we currently manually copy the files from
 PostGIS and then apply a few code changes that are required to compile it
 with MobilityDB. To simplify this process of updating liblwgeom versions,
 it would help if we coud simply copy the files without having to modify
 them after. This patch contains the manual changes that were necessary
 when updating from 3.4 to 3.5.

 This patch exports the circ_tree_distance_tree_internal function that we
 are also interested in using and replaces a deprecate pzero call with a
 memset.
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5784>
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