[MacPorts] #65333: zig 0.10.0 fails to build on arm64

[MacPorts]

#65333: zig 0.10.0 fails to build on arm64
---------------------------+------------------------
  Reporter:  i0ntempest    |      Owner:  i0ntempest
      Type:  defect        |     Status:  reopened
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.7.2
Resolution:                |   Keywords:
      Port:  zig, llvm-13  |
---------------------------+------------------------

Comment (by kencu):

 this flag

 `-fallow-shlib-undefined`

 might do it

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Ticket URL: <https://trac.macports.org/ticket/65333#comment:27>
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