[MacPorts] #66073: LLVM-15 missing dependency zstd (re-upgrade)

[MacPorts]

#66073: LLVM-15 missing dependency zstd (re-upgrade)
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  Reporter:  Gcenx    |      Owner:  (none)
      Type:  defect   |     Status:  new
  Priority:  Normal   |  Milestone:
 Component:  ports    |    Version:  2.8.0
Resolution:           |   Keywords:
      Port:  llvm-15  |
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Comment (by cjones051073):

 Indeed, it looks like the build opportunistically finds and uses zstd
 (installed during the build via the cmake dependency). Simpliest fix is to
 just add it as an explicit dep.

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Ticket URL: <https://trac.macports.org/ticket/66073#comment:1>
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