[MacPorts] #56814: libvpx forces the use of clang-3.9

[MacPorts]

#56814: libvpx forces the use of clang-3.9
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  Reporter:  ryandesign  |      Owner:  dbevans
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:
      Port:  libvpx      |
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Comment (by phriedrich):

 It seems it builds fine with the compiler coming with current Xcode 10 on
 Mojave beta. I just commented out the clang-3.9 requirement and it looks
 good.

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Ticket URL: <https://trac.macports.org/ticket/56814#comment:1>
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