[MacPorts] #72254: Please update libxml2 to 2.14

[MacPorts]

#72254: Please update libxml2 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 jmroot):

 Replying to [ticket:72254 szhorvat]:
 > Can you clarify why the inclusion of `iconv.h` is currently patched to
 include the full path to the MacPorts version, even though the compiler is
 already given the `-I/opt/local/include` option?

 Clients could easily only use `-I/opt/local/include/libxml2`, particularly
 when building outside of MacPorts.

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Ticket URL: <https://trac.macports.org/ticket/72254#comment:1>
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