[MacPorts] #54520: Avidemux: Update to 2.6.20 and misc changes

[MacPorts]

#54520: Avidemux: Update to 2.6.20 and misc changes
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  Reporter:  bgrupe27  |      Owner:
      Type:  update    |     Status:  new
  Priority:  Normal    |  Milestone:
 Component:  ports     |    Version:
Resolution:            |   Keywords:
      Port:  avidemux  |
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Changes (by bgrupe27):

 * Attachment "admCheckX264.cmake.diff" added.

 x264 diff

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Ticket URL: <https://trac.macports.org/ticket/54520>
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