[MacPorts] #64675: fix libvpx for PowerPC and update ffmpeg accordingly

[MacPorts]

#64675: fix libvpx for PowerPC and update ffmpeg accordingly
-----------------------------+-------------------------------------
  Reporter:  barracuda156    |      Owner:  (none)
      Type:  enhancement     |     Status:  new
  Priority:  Normal          |  Milestone:
 Component:  ports           |    Version:  2.7.1
Resolution:                  |   Keywords:  powerpc, leopard, tiger
      Port:  libvpx, ffmpeg  |
-----------------------------+-------------------------------------

Comment (by barracuda156):

 I have built it on Leopard for ppc32 target:

 {{{
 36-47:~ svacchanda$ port -v installed libvpx
 The following ports are currently installed:
   libvpx @1.6.1_0 requested_variants='-universal' platform='darwin 9'
 archs='ppc' date='2022-02-16T21:07:00+0800'
   libvpx @1.11.0_1 (active) requested_variants='' platform='darwin 9'
 archs='ppc' date='2022-02-19T01:12:05+0800'
 }}}

 Cannot test it right now because `pango` fails which I need to build
 `ffmpeg`: https://trac.macports.org/ticket/64690

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Ticket URL: <https://trac.macports.org/ticket/64675#comment:4>
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