[PostGIS] #3676: Add LEAKPROOF indication in functions

[PostGIS]

#3676: Add LEAKPROOF indication in functions
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  Reporter:  strk     |      Owner:  robe
      Type:  defect   |     Status:  new
  Priority:  low      |  Milestone:  PostGIS Fund Me
 Component:  postgis  |    Version:  master
Resolution:           |   Keywords:
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Comment (by Darafei Praliaskouski <me@…>):

 In [changeset:"2045b9774fec76e87c758276459c0b1d94632c81/git" 2045b97/git]:
 {{{#!CommitTicketReference repository="git"
 revision="2045b9774fec76e87c758276459c0b1d94632c81"
 postgis: mark btree comparisons leakproof

 The geometry and geography btree comparison support functions use
 serialized-value comparison and hashing without GEOS or GDAL calls. Mark
 this audited subset LEAKPROOF so security-barrier relations can use these
 operators more effectively.

 References #3676
 }}}
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/3676#comment:9>
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