[MacPorts] #59487: gdal: Use pkg-config to find libxml2 to remove overlinking

[MacPorts]

#59487: gdal: Use pkg-config to find libxml2 to remove overlinking
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  Reporter:  ryandesign  |      Owner:  Veence
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.6.2
Resolution:              |   Keywords:
      Port:  gdal        |
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Comment (by Dave-Allured):

 It looks like this was fixed upstream in gdal 3.1.0 to use pkg-config.
 Therefore no patch should be needed for gdal 3.1.0 forward.\\
 https://github.com/OSGeo/gdal/blob/v3.1.0/gdal/NEWS

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Ticket URL: <https://trac.macports.org/ticket/59487#comment:1>
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