[MacPorts] #71808: gcc7-bootstrap and gcc7 are based on same GCC sources, but use different tape archive files

[MacPorts]

#71808: gcc7-bootstrap and gcc7 are based on same GCC sources, but use different
tape archive files
-----------------------------------+--------------------
  Reporter:  ballapete             |      Owner:  (none)
      Type:  defect                |     Status:  new
  Priority:  Normal                |  Milestone:
 Component:  ports                 |    Version:  2.10.5
Resolution:                        |   Keywords:
      Port:  gcc7-bootstrap, gcc7  |
-----------------------------------+--------------------

Comment (by jmroot):

 It would be to avoid a dependency on xz in the bootstrap port.

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Ticket URL: <https://trac.macports.org/ticket/71808#comment:1>
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