[MacPorts] #64781: x265: can we fix Altivec for PowerPC?

[MacPorts]

#64781: x265: can we fix Altivec for PowerPC?
---------------------------+-------------------------------------
  Reporter:  barracuda156  |      Owner:  (none)
      Type:  defect        |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.7.2
Resolution:                |   Keywords:  powerpc, leopard, ppc64
      Port:  x265          |
---------------------------+-------------------------------------

Comment (by barracuda156):

 So Altivec implementation uses instructions from later ISA, unsupported on
 Darwin. Tried adding `altivec.h` and using `gcc12`, still fails. We just
 have to disable Altivec on PPC.

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Ticket URL: <https://trac.macports.org/ticket/64781#comment:7>
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