[PostGIS] #5281: Start preparing for PostgreSQL move to meson

[PostGIS]

#5281: Start preparing for PostgreSQL move to meson
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  Reporter:  robe    |      Owner:  strk
      Type:  defect  |     Status:  new
  Priority:  medium  |  Milestone:  PostGIS 3.5.0
 Component:  build   |    Version:  master
Resolution:          |   Keywords:
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Changes (by robe):

 * milestone:  PostGIS Fund Me => PostGIS 3.5.0

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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5281#comment:3>
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