[MacPorts] #59133: libgcc9 fails to build with Mojave and Xcode 11 latestrelease

[MacPorts]

#59133: libgcc9 fails to build with Mojave and Xcode 11 latestrelease
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  Reporter:  vdoublie  |      Owner:  (none)
      Type:  defect    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:  2.6.0
Resolution:            |   Keywords:
      Port:  libgcc9   |
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Changes (by vdoublie):

 * Attachment "main_cat_20191010.log.gz" added.

 Catalina build failing with very same error as prior Mojave + Xcode beta
 builds

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Ticket URL: <https://trac.macports.org/ticket/59133>
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