[MacPorts] #54982: port pinentry-mac fails to build on macOS 10.13 High Sierra with Xcode 9.0

[MacPorts]

#54982: port pinentry-mac fails to build on macOS 10.13 High Sierra with Xcode 9.0
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  Reporter:  korseby       |      Owner:  Ionic
      Type:  defect        |     Status:  assigned
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.4.1
Resolution:                |   Keywords:  highsierra
      Port:  pinentry-mac  |
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Comment (by GwynethLlewelyn):

 I had the same bug when compiling `graphviz-gui`. As per @korseby's
 suggestion, re-installing
 `/Applications/Xcode.app/Contents/Resources/Packages/XcodeSystemResources.pkg`
 also fixed the problem for me.

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Ticket URL: <https://trac.macports.org/ticket/54982#comment:5>
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