[MacPorts] #55800: libvpx 1.7.0_0 build fails

[MacPorts]

#55800: libvpx 1.7.0_0 build fails
---------------------------+--------------------
 Reporter:  laughingtiger  |      Owner:
     Type:  defect         |     Status:  new
 Priority:  Normal         |  Milestone:
Component:  ports          |    Version:  2.4.2
 Keywords:                 |       Port:  libvpx
---------------------------+--------------------
 when upgrading ffmpeg 3.4.1_3 < 3.4.1_4 the upgrade libvpx 1.6.1_1 <
 1.7.0_0 fails with Error: Failed to build libvpx: command execution
 failed.
 See attached log file.

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Ticket URL: <https://trac.macports.org/ticket/55800>
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