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

[MacPorts]

#59068: carthage @0.33.0_0 build fails with Xcode 11
-------------------------+-----------------------
  Reporter:  i0ntempest  |      Owner:  saagarjha
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.5.4
Resolution:              |   Keywords:
      Port:  carthage    |
-------------------------+-----------------------
Changes (by mf2k):

 * cc: saagarjha (removed)
 * owner:  (none) => saagarjha
 * status:  new => assigned


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Ticket URL: <https://trac.macports.org/ticket/59068#comment:1>
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