[postgis-tickets] [PostGIS] #4968: Upgrade autogen.sh on PostGIS 2.4, 2.5, 3.0

[PostGIS]

#4968: Upgrade autogen.sh on PostGIS 2.4, 2.5, 3.0
----------------------+----------------------------
  Reporter:  robe     |      Owner:  robe
      Type:  defect   |     Status:  assigned
  Priority:  blocker  |  Milestone:  PostGIS 2.4.10
 Component:  postgis  |    Version:  2.4.x
Resolution:           |   Keywords:
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Comment (by Regina Obe <lr@…>):

 In [changeset:"1814f8a288b8f4965e4422f283dec926cfeeaccc/git"
 1814f8a2/git]:
 {{{
 #!CommitTicketReference repository="git"
 revision="1814f8a288b8f4965e4422f283dec926cfeeaccc"
 Backport autogen.sh changes from 3.1 to address autoconf 2.71, references
 #4968 for PostGIS 2.5.6
 }}}

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Ticket URL: <https://trac.osgeo.org/postgis/ticket/4968#comment:2>
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