[MacPorts] #59486: gdal: add libxml2 dependency

[MacPorts]

#59486: gdal: add libxml2 dependency
-------------------------+----------------------
  Reporter:  ryandesign  |      Owner:  Veence
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.6.2
Resolution:              |   Keywords:  haspatch
      Port:  gdal        |
-------------------------+----------------------
Changes (by ryandesign):

 * keywords:   => haspatch


Comment:

 I've [https://github.com/macports/macports-ports/pull/7574 submitted a PR]
 to fix this. There were a couple other opportunistic library usages that I
 fixed as well.

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Ticket URL: <https://trac.macports.org/ticket/59486#comment:1>
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