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

[MacPorts]

#58260: libgcc8 build fails due to "Atomic" error on Mojave
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  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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Comment (by SerpentChris):

 I've got the same error on my brand new iMac running 10.14.4.

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Ticket URL: <https://trac.macports.org/ticket/58260#comment:2>
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