[PostGIS] #5655: make check fails when you do not have docs building/testing requirements (build works)

[PostGIS]

#5655: make check fails when you do not have docs building/testing requirements
(build works)
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  Reporter:  strk    |      Owner:  strk
      Type:  defect  |     Status:  new
  Priority:  medium  |  Milestone:  PostGIS 3.6.0
 Component:  build   |    Version:  3.4.x
Resolution:          |   Keywords:  documentation, testsuite
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Changes (by robe):

 * milestone:  PostGIS 3.4.4 => PostGIS 3.6.0

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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5655#comment:4>
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