[MacPorts] #55255: docbook-xsl @1.79.2_0 changed stylesheet URIs and broke existing XML files (regression)

[MacPorts]

#55255: docbook-xsl @1.79.2_0 changed stylesheet URIs and broke existing XML files
(regression)
------------------------+-------------------------
 Reporter:  lbschenkel  |      Owner:
     Type:  defect      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:
 Keywords:              |       Port:  docbook-xsl
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 Version 1.79.2 released on GitHub changed the canonical URL for the
 stylesheets from `http://docbook.sourceforge.net` to
 `http://cdn.docbook.org`:
 https://github.com/docbook/xslt10-stylesheets/releases/tag/release%2F1.79.2

 This means that existing DocBook XML files that use the the former will
 now not find the local copy installed by the port, and either trigger a
 download from that URI or fail (in case download is forbidden).

 This is preventing at least one port to build, as reported here:
 - https://trac.macports.org/ticket/55253

 I'm not sure what the correct solution is:
 - if all dependent ports should patch their XML files with the new URI
 - make both URIs be supported somehow (not sure if this is even possible)
 - make "legacy" and "new" `docbook-xsl` be installable side-by-side

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Ticket URL: <https://trac.macports.org/ticket/55255>
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