[MacPorts] #58260: libgcc8 build fails due to "Atomic" error on Mojave

[MacPorts]

#58260: libgcc8 build fails due to "Atomic" error on Mojave
---------------------------+--------------------
  Reporter:  physicsbeany  |      Owner:  (none)
      Type:  defect        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.5.4
Resolution:                |   Keywords:  atomic
      Port:  libgcc8       |
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Changes (by physicsbeany):

 * Attachment "libgcc8_INSTALLFAILURE_TRUNCATED.log" added.

 last 50K lines of log file (whole thing is 64 MB)

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Ticket URL: <https://trac.macports.org/ticket/58260>
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