[MacPorts] #59063: gdal: change perf variant to native

[MacPorts]

#59063: gdal: change perf variant to native
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 Reporter:  ryandesign  |      Owner:  Veence
     Type:  defect      |     Status:  assigned
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:
 Keywords:              |       Port:  gdal
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 Joshua mentioned on the list that we decided to standardize on the variant
 "native" for compiling code optimized to the native CPU, but gdal's
 variant for that purpose is named "perf" so it should be renamed (leaving
 a compatibility variant for one year enabling users to seamlessly upgrade
 to the new variant name).

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Ticket URL: <https://trac.macports.org/ticket/59063>
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