[MacPorts] #40154: libvpx: don't depend on yasm on PowerPC

[MacPorts]

#40154: libvpx: don't depend on yasm on PowerPC
------------------------+---------------------
  Reporter:  ballapete  |      Owner:  dbevans
      Type:  defect     |     Status:  closed
  Priority:  Low        |  Milestone:
 Component:  ports      |    Version:  2.2.99
Resolution:  fixed      |   Keywords:  powerpc
      Port:  libvpx     |
------------------------+---------------------

Comment (by ballapete):

 `libvpx` is now `@1.13.1` and I do not need it on both `PPC Tiger` and
 `PPC Leopard`, so this ticket can be closed.

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Ticket URL: <https://trac.macports.org/ticket/40154#comment:13>
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