[MacPorts] #54480: VLC: upgrade to 2.2.6 and FFmpeg 3

[MacPorts]

#54480: VLC: upgrade to 2.2.6 and FFmpeg 3
---------------------+---------------------------------
  Reporter:  RJVB    |      Owner:
      Type:  update  |     Status:  new
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:
Resolution:          |   Keywords:  haspatch maintainer
      Port:  VLC     |
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Comment (by RJVB):

 Attaching a diff against the updated Portfile would have been easier...

 Anyway, I really dislike that Tcl expansion operator and `port:libVLC-
 devel` exists on my end (subport of the unmaintained VLC-devel) but yeah,
 your modifications should not introduce any behaviour changes.

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Ticket URL: <https://trac.macports.org/ticket/54480#comment:11>
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