[postgis-tickets] [PostGIS] #5533: Give a better error message when docbook5 files are missing

[PostGIS]

#5533: Give a better error message when docbook5  files are missing
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 Reporter:  strk           |      Owner:  strk
     Type:  defect         |     Status:  assigned
 Priority:  medium         |  Milestone:  PostGIS 3.5.0
Component:  documentation  |    Version:  master
 Keywords:  docbook        |
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 Rather than these scary messages:
 https://github.com/postgis/postgis/actions/runs/6165616469/job/16733693326

 It would be useful to know, say, at ./configure time, that the required
 docbook 5 tools are missing.

 We need docbook5-xml to validate the XML and possibly also to create the
 html and pdf and epub versions

 A possible way to check could be running:
 > xmlcatalog "" 'http://docbook.org/xml/5.0/rng/docbook.rng'

 Which should exit with an error when docbook5-xml package is missing,
 although we might be more specific about what we need
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5533>
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