[MacPorts] #54215: gcc7: broken on powerpc

[MacPorts]

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

 * Attachment "gcc7-darwin-ppc-Portfile.diff" added.

 Portfile changes for use with the patch mentioned in GCC Bugzilla 80865

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