[MacPorts] #57059: Unable to build libgcc45-4.5.4_15 on MacOS 10.12 with Xcode 9.2

[MacPorts]

#57059: Unable to build libgcc45-4.5.4_15 on MacOS 10.12 with Xcode 9.2
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  Reporter:  Xof       |      Owner:  (none)
      Type:  defect    |     Status:  reopened
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:
Resolution:            |   Keywords:
      Port:  libgcc45  |
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Comment (by ryandesign):

 I'm not sure it's the same issue. I don't have a Sierra system easily to
 hand at the moment to test it.

 Our Sierra buildbot worker succeeded in building gcc45 and libgcc45 back
 on June 6 and we have those binaries on our packages server, but libgcc45
 was updated in August and that rebuild did not succeed on Sierra. I'm
 triggering a rebuild to see what the problem is there:

 https://build.macports.org/builders/ports-10.12_x86_64-builder/builds/66746

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Ticket URL: <https://trac.macports.org/ticket/57059#comment:6>
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