[MacPorts] #56417: transcode @1.1.7_21 fails to build with ffmpeg 4

[MacPorts]

#56417: transcode @1.1.7_21 fails to build with ffmpeg 4
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  Reporter:  tehcog     |      Owner:  (none)
      Type:  defect     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:  2.4.3
Resolution:             |   Keywords:
      Port:  transcode  |
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Comment (by ajdudman):

 Linux may have fixed this, while FreshPorts may be lagging somewhat.  Arch
 Linux is easiest for me to follow.  Is it okay to do this?  Additionally,
 I have the universal variant working.  Since the newer patches need patch
 prefix stripping, I renamed and adjusted 3 MacPorts patches.  By the way,
 http-style uri parsing for path and query must be used to fetch the newer
 patches.

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Ticket URL: <https://trac.macports.org/ticket/56417#comment:2>
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