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

[MacPorts]

#71877: fizz, folly, mvfst: remove libunwind dependency
------------------------+--------------------------------
 Reporter:  mohd-akram  |      Owner:  barracuda156
     Type:  defect      |     Status:  assigned
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:
 Keywords:              |       Port:  fizz, folly, mvfst
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 libunwind gets opportunistically linked when building other software on
 recent macOS versions and shouldn't be installed.

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