[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:
Resolution:                      |   Keywords:
      Port:  fizz, folly, mvfst  |
---------------------------------+--------------------------

Comment (by barracuda156):

 Ok, 10.6.8 (tested on powerpc, but I assume this holds generally) does not
 require `libunwind` to build `folly`.

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Ticket URL: <https://trac.macports.org/ticket/71877#comment:2>
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