[MacPorts] #71427: ffmpeg7 - Fails to Vuild on El Capitan - error: must use 'enum' tag to refer to type 'AVMediaType'

[MacPorts]

#71427: ffmpeg7 - Fails to Vuild on El Capitan - error: must use 'enum' tag to
refer to type 'AVMediaType'
-----------------------+---------------------
 Reporter:  RobK88     |      Owner:  (none)
     Type:  defect     |     Status:  new
 Priority:  Normal     |  Milestone:
Component:  ports      |    Version:  2.10.5
 Keywords:  elcapitan  |       Port:  ffmpeg7
-----------------------+---------------------
 ffmpeg7 fails to build on El Capitan.

 `libavdevice/avfoundation.m:766:41: error: must use 'enum' tag to refer to
 type 'AVMediaType'`

 See attached main.log for more details.

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Ticket URL: <https://trac.macports.org/ticket/71427>
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