[MacPorts] #69944: zstd @ 1.5.6: does not respect macos setting on build

[MacPorts]

#69944: zstd @ 1.5.6: does not respect macos setting on build
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  Reporter:  lukaso  |      Owner:  (none)
      Type:  defect  |     Status:  new
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:
Resolution:          |   Keywords:
      Port:  zstd    |
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Comment (by lukaso):

 It looks like this bug was introduced upstream in v1.5.6

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Ticket URL: <https://trac.macports.org/ticket/69944#comment:1>
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