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

[MacPorts]

#59487: gdal: Use pkg-config to find libxml2 to remove overlinking
------------------------+----------------------
 Reporter:  ryandesign  |      Owner:  Veence
     Type:  defect      |     Status:  assigned
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:  2.6.2
 Keywords:              |       Port:  gdal
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 Please patch gdal to use pkg-config, rather than xml2-config, to find
 libxml2, so that gdal does not end up overlinked to libxml2's
 dependencies. See https://lists.macports.org/pipermail/macports-
 dev/2019-October/041397.html for more info.

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