[MacPorts] #28747: bump mkvtoolnix 4.4.0 -> 4.6.0

[MacPorts]

#28747: bump mkvtoolnix 4.4.0 -> 4.6.0
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 Reporter:  Kona8lend@…          |       Owner:  ruud@…       
     Type:  update               |      Status:  new          
 Priority:  Normal               |   Milestone:               
Component:  ports                |     Version:               
 Keywords:  haspatch             |        Port:  mkvtoolnix   
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Comment(by ruud@…):

 I had lzo installed before I started. When upgrading it pulled in lzo2,
 after that I uninstalled lzo. Does that count?

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Ticket URL: <https://trac.macports.org/ticket/28747#comment:5>
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