[MacPorts] #59068: carthage @0.33.0_0 build fails with Xcode 11

[MacPorts]

#59068: carthage @0.33.0_0 build fails with Xcode 11
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  Reporter:  i0ntempest  |      Owner:  saagarjha
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.5.4
Resolution:              |   Keywords:  xcode11
      Port:  carthage    |
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Comment (by saagarjha):

 Managed to reproduce this once I got around swift build not being able to
 find my developer tools. It seems like the bug has already been reported
 in the relevant places: https://bugs.swift.org/browse/SR-11423,
 https://github.com/Carthage/Carthage/issues/2831. The latter has a
 "workaround" if you ''really'' need this to work, but since this is a
 Swift bug I think we should wait for them to fix it instead of just
 applying the band-aid patch.

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Ticket URL: <https://trac.macports.org/ticket/59068#comment:4>
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