[MacPorts] #36466: mkvtoolnix: update to 5.8.0

[MacPorts]

#36466: mkvtoolnix: update to 5.8.0
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 Reporter:  bgrupe@…  |      Owner:  macports-tickets@…
     Type:  update    |     Status:  new
 Priority:  Normal    |  Milestone:
Component:  ports     |    Version:  2.1.2
 Keywords:            |       Port:  mkvtoolnix
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 Hi,

 I have prepared a port update. Changes are: switching to gcc47 (now
 required), switching to wxwidgets30 (required on Lion or higher with newer
 Xcodes).

 it also fixes #34905 but sadly it doesn't fix #34806 yet.

 I'm submitting this portfile anyhow so any work that'll go into #34806 can
 use the updated port as a baseline.

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Ticket URL: <https://trac.macports.org/ticket/36466>
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