[MacPorts] #59340: libgcc9 @9.2.0 +universal: fails to build using 10.13 SDK

[MacPorts]

#59340: libgcc9 @9.2.0 +universal: fails to build using 10.13 SDK
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 Reporter:  gverm   |      Owner:  (none)
     Type:  defect  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:  2.6.1
 Keywords:          |       Port:  libgcc9
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 I'm running macOS Mojave (fully updated) with XCode 11.1.\\
 I patched/configured MacPorts to always use the 10.13 SDK.\\
 Log file is attached.

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Ticket URL: <https://trac.macports.org/ticket/59340>
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