[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:  MarcusCalhoun
      Type:  defect  |     Status:  assigned
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:
Resolution:          |   Keywords:
      Port:  zstd    |
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Comment (by lukaso):

 > whether you had to parse the otool -l output or if there was a better
 API

 I parse `otool -l` to answer your actual question.

 > how you were collecting the list of libraries that you needed to check

 I use a bunch of packaging scripts, which, to make a long story short,
 follow all the library dependencies from `GIMP` on down and copy them into
 the relevant directories, while fixing up @rpaths and doing a bunch of
 other admin. I then run this script on all libraries that have been copied
 in and which will eventually be packaged into `GIMP.app`.

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Ticket URL: <https://trac.macports.org/ticket/69944#comment:8>
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