[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:  macports-tickets@…                   
     Type:  update               |      Status:  new                                  
 Priority:  Normal               |   Milestone:                                       
Component:  ports                |     Version:  1.9.2                                
 Keywords:                       |        Port:  mkvtoolnix                           
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 - bump to mkvtoolnix 4.6.0
 - remove patchfiles which are now integrated upstream
 - use drake parallel build option
 - switch dependency port:lzo -> port:lzo2

 Tested on Snow Leopard 10.6.6 x86_64 arch.

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