[MacPorts] #65573: libgcc12: build fails for macOS 12.6 and 13 Beta

[MacPorts]

#65573: libgcc12: build fails for macOS 12.6 and 13 Beta
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  Reporter:  adamgao1996  |      Owner:  (none)
      Type:  defect       |     Status:  new
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.7.2
Resolution:               |   Keywords:  monterey
      Port:  libgcc12     |
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Comment (by ttelford):

 I've had this issue for a while, and I can say exactly why I can't use the
 prebuilt binary:  Unavoidable corporate proxy forbids access to the
 prebuilt versions.

 I see the error from macOS 12.5.1

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Ticket URL: <https://trac.macports.org/ticket/65573#comment:16>
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