[MacPorts] #53802: x86_64-elf-gcc @6.3.0_0: Port update

[MacPorts]

#53802: x86_64-elf-gcc @6.3.0_0: Port update
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  Reporter:  stevecheckoway  |      Owner:
      Type:  update          |     Status:  assigned
  Priority:  Normal          |  Milestone:
 Component:  ports           |    Version:
Resolution:                  |   Keywords:  haspatch
      Port:  x86_64-elf-gcc  |
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Comment (by anatol):

 x86_64-elf-gcc is a useful tool for cross compilation and it would be
 great to see it updated to the latest stable version (that is 7.1 at this
 moment). Would it be possible to bump the package?

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Ticket URL: <https://trac.macports.org/ticket/53802#comment:3>
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