[MacPorts] #64767: Apple Silicon cpu capabilities

[MacPorts]

#64767: Apple Silicon cpu capabilities
-------------------------+--------------------
 Reporter:  0xdd-co      |      Owner:  (none)
     Type:  enhancement  |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:
 Keywords:               |       Port:  x265
-------------------------+--------------------
 I noticed drastically slower HEVC encoding using ffmpeg/x265 on my MacBook
 Pro compared to Handbrake. When I run `x265 -V`, I noticed the following:

 ```
 x265 [info]: HEVC encoder version 0.0
 x265 [info]: build info [Mac OS X][clang 13.0.0][32 bit][noasm] 8bit
 x265 [info]: using cpu capabilities: none!
 ```

 Seems like the Handbrake build has NEON listed under cpu capabilities,
 which might account for the slightly faster encoding time.

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Ticket URL: <https://trac.macports.org/ticket/64767>
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