[MacPorts] #59750: ffmpeg and ffmpeg-devel immediately crash with segfault 11 when input is mp4

[MacPorts]

#59750: ffmpeg and ffmpeg-devel immediately crash with segfault 11 when input is
mp4
---------------------+----------------------
  Reporter:  fdik    |      Owner:  dbevans
      Type:  defect  |     Status:  assigned
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:  2.6.2
Resolution:          |   Keywords:
      Port:  ffmpeg  |
---------------------+----------------------

Comment (by eirnym):

 Currently I set the "fixed_xcode_version" to 11.5 in my MacPorts. to make
 sure that it works fine in my environment. If it's an accepted change,
 I'll prepare a PR

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Ticket URL: <https://trac.macports.org/ticket/59750#comment:12>
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