[MacPorts] #44758: p5-mhonarc: update to 2.6.19

[MacPorts]

#44758: p5-mhonarc: update to 2.6.19
--------------------------+------------------------
 Reporter:  ryandesign@…  |      Owner:  markd@…
     Type:  update        |     Status:  new
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:  2.3.99
 Keywords:  haspatch      |       Port:  p5-mhonarc
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 This patch updates p5-mhonarc to 2.6.19, adds p5.18 and p5.20 subports,
 corrects the man path, adds the standard modeline, and uses `system`'s
 `-W` argument instead of manually running `cd`. It builds for me.
 According to the project web site:

 > MHonArc releases prior to v2.6.18 have known vulnerabilities to the HTML
 filter, making web sites hosting MHonArc web archives vulnerable to XSS
 attackes. All users are STRONGLY encouraged to upgrade to the latest
 release.

 If it looks ok to you I can commit it.

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Ticket URL: <https://trac.macports.org/ticket/44758>
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