[PostGIS] #5593: Fails to build with imagemagic 6.9.12.98

[PostGIS]

#5593: Fails to build with imagemagic 6.9.12.98
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  Reporter:  Bas Couwenberg  |      Owner:  strk
      Type:  defect          |     Status:  closed
  Priority:  medium          |  Milestone:  PostGIS 3.4.1
 Component:  build           |    Version:  3.4.x
Resolution:  wontfix         |   Keywords:
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Comment (by mdavis):

 Or should we switch to including the image file (PNG or maybe also SVG) in
 the repo?  So that only documentation maintainers need to generate images.
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5593#comment:5>
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