[PostGIS] #5968: Remove generated files in distclean target

[PostGIS]

#5968: Remove generated files in distclean target
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  Reporter:  Bas Couwenberg  |      Owner:  strk
      Type:  defect          |     Status:  new
  Priority:  medium          |  Milestone:  PostGIS 3.6.0
 Component:  build           |    Version:  master
Resolution:                  |   Keywords:
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Changes (by Bas Couwenberg):

 * Attachment "clean.patch" added.

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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5968>
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