[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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Comment (by kencu):

 Chris added a patch that should fix building gcc9 against the 10.15 SDK.
 So it should "just work" now.

 All other gcc versions remain broken, however, building against that SDK.

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Ticket URL: <https://trac.macports.org/ticket/59133#comment:8>
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