[MacPorts] #52984: Upgrade camlp5 to 6.17

[MacPorts]

#52984: Upgrade camlp5 to 6.17
-----------------------+----------------------
  Reporter:  pmetzger  |      Owner:
      Type:  update    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.3.5
Resolution:            |   Keywords:  haspatch
      Port:  camlp5    |
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Comment (by raimue):

 The github port group contains documentation in the
 [https://github.com/macports/macports-
 ports/blob/master/_resources/port1.0/group/github-1.0.tcl code]. There are
 also plenty of ports using this port group in the ports tree.

 The [https://guide.macports.org/chunked/reference.portgroup.html section
 on port groups] in the guide could include more port groups and there are
 plenty of open requests: #25170, #32428, #39412. Although, most port
 groups have good documentation inline, where it is less likely to go out
 of sync. Contributions to the guide are very welcome, I recently added
 some docs on [https://guide.macports.org/chunked/project.docs.html how the
 guide can be updated] by anyone.

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Ticket URL: <https://trac.macports.org/ticket/52984#comment:6>
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