[MacPorts] #57234: Some ports are failing to build due to new build system in Xcode 10

[MacPorts]

#57234: Some ports are failing to build due to new build system in Xcode 10
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  Reporter:  mf2k                                |      Owner:  (none)
      Type:  defect                              |     Status:  new
  Priority:  Normal                              |  Milestone:
 Component:  ports                               |    Version:
Resolution:                                      |   Keywords:  xcode10
      Port:  BGHUDAppKit  cotvnc gimp-app        |
  macports-notifier MacVim pinentry-mac          |
  terminal-notifier unison VLC xhyve             |
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Comment (by ryandesign):

 We are certain that there is a problem with these ports and the new build
 system? We are certain it isn't solved by the change proposed in #57137?

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Ticket URL: <https://trac.macports.org/ticket/57234#comment:29>
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