[MacPorts] #59384: boost uses zstd if present

[MacPorts]

#59384: boost uses zstd if present
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  Reporter:  ryandesign  |      Owner:  michaelld
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.6.1
Resolution:              |   Keywords:
      Port:  boost       |
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Comment (by ryandesign):

 boost opportunistically uses zstd, so the dependency should be added and
 the revision should be increased so that all users get the rebuilt boost
 that uses zstd. If boost also uses lzma, then you can add that dependency
 too.

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Ticket URL: <https://trac.macports.org/ticket/59384#comment:4>
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