[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 yan12125):

 As a side note, the port welly-clyang fails to build with Xcode 10.2.1 (1)
 while it builds fine with Xcode 11 beta 3 on my machine.

 (1)
 https://build.macports.org/builders/ports-10.14_x86_64-builder/builds/34157/steps
 /install-port/logs/stdio

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Ticket URL: <https://trac.macports.org/ticket/57234#comment:35>
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