[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:
 Keywords:              |       Port:  libvpx
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 The libvpx port forces the use of clang-3.9 on some systems. The comments
 in the Portfile suggest this is because clang 3.9 was new at the time, and
 MacPorts would otherwise choose clang 3.7, which was too old.

 The situation has now changed, in that clang 3.9 is now old, and it is
 annoying to have to install this old version when we would rather use
 clang 5.0 or 6.0. Could you fix the port, please, to prefer newer clangs?

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