[MacPorts] #72254: libxml2: update to 2.14

[MacPorts]

#72254: libxml2: update to 2.14
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  Reporter:  szhorvat  |      Owner:  (none)
      Type:  update    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:
Resolution:            |   Keywords:
      Port:  libxml2   |
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Comment (by ryandesign):

 That sounds like several times the amount of work involved in just
 updating the port.

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Ticket URL: <https://trac.macports.org/ticket/72254#comment:10>
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