[MacPorts] #56518: gdal @2.3.0 uses zstd without declaring a dependency on it

[MacPorts]

#56518: gdal @2.3.0 uses zstd without declaring a dependency on it
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  Reporter:  ryandesign  |      Owner:  Veence
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:
      Port:  gdal        |
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Comment (by Veence):

 I’ve carried on tinkering with GDAL all day, but I've hit a wall. I’ll
 commit what I've done tomorrow, that should at least fix what you
 reported.
 Sorry for the delay

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Ticket URL: <https://trac.macports.org/ticket/56518#comment:1>
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