[MacPorts] #54215: gcc7, libgcc: broken on powerpc

[MacPorts]

#54215: gcc7, libgcc: broken on powerpc
---------------------------+----------------------
  Reporter:  mojca         |      Owner:
      Type:  defect        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:
Resolution:                |   Keywords:  haspatch
      Port:  gcc7, libgcc  |
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Changes (by ccorn):

 * Attachment "gcc7-buildfix+abi-variants+safepatches-p3.diff" added.

 gcc7 build fix, ABI-related variants, plus another couple of Darwin-
 specific patches which look like they cannot break anything.

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Ticket URL: <https://trac.macports.org/ticket/54215>
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