[MacPorts] #71877: fizz, folly, mvfst: remove libunwind dependency

[MacPorts]

#71877: fizz, folly, mvfst: remove libunwind dependency
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  Reporter:  mohd-akram          |      Owner:  barracuda156
      Type:  defect              |     Status:  assigned
  Priority:  Normal              |  Milestone:
 Component:  ports               |    Version:
Resolution:                      |   Keywords:
      Port:  fizz, folly, mvfst  |
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Comment (by barracuda156):

 Replying to [ticket:71877 mohd-akram]:
 > libunwind gets opportunistically linked when building other software on
 recent macOS versions and shouldn't be installed.

 If you have confirmed that `folly` and its dependents build fine without
 `libunwind`, you could remove it.
 I can check if 10.6 still needs it or not. 10.5 likely does, but I cannot
 test in on 10.5.

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Ticket URL: <https://trac.macports.org/ticket/71877#comment:1>
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