[MacPorts] #38388: libxml2: update to 2.9.0

[MacPorts]

#38388: libxml2: update to 2.9.0
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  Reporter:  ryandesign@…        |      Owner:  cedric.luthi@…
      Type:  update              |     Status:  new
  Priority:  Normal              |  Milestone:
 Component:  ports               |    Version:
Resolution:                      |   Keywords:
      Port:  libxml2 py-libxml2  |
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Changes (by jmr@…):

 * cc: sfiera@…, mcalhoun@… (added)
 * port:  libxml2 => libxml2 py-libxml2


Comment:

 py-libxml2 is built from the same sources and should be updated as well.

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Ticket URL: <https://trac.macports.org/ticket/38388#comment:1>
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