[MacPorts] #47907: libvpx: update to 1.4.0

[MacPorts]

#47907: libvpx: update to 1.4.0
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  Reporter:  ryandesign@…  |      Owner:  devans@…
      Type:  update        |     Status:  assigned
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:
Resolution:                |   Keywords:  haspatch
      Port:  libvpx        |
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Comment (by ryandesign@…):

 As far as I know, there weren't and aren't any ppc build problems. (There
 was the problem that you could not build for ppc on Snow Leopard, which I
 already corrected in the update to 1.4.0, since that's a thing I want to
 be able to do.) The only reported "problem" was #40154 which was just that
 an unnecessary dependency was added, which is now fixed. I'll attach a
 revised patch for the remainder of the update that's still needed.

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Ticket URL: <https://trac.macports.org/ticket/47907#comment:8>
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