[MacPorts] #43222: mkvtoolnix: upgrade to version 6.8.0

[MacPorts]

#43222: mkvtoolnix: upgrade to version 6.8.0
-------------------------+--------------------------------
  Reporter:  dgonyier@…  |      Owner:  macports-tickets@…
      Type:  update      |     Status:  closed
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:  fixed       |   Keywords:
      Port:  mkvtoolnix  |
-------------------------+--------------------------------

Comment (by pixilla@…):

 I have mkvextract working on Mountain Lion after installing "boost +gcc49"
 and force upgrading flac, gettext and pcre with macports-gcc-4.9.
 Previously flac, get text and pcre linked with:
 {{{
 /usr/lib/libstdc++.6.dylib (compatibility version 7.0.0, current version
 56.0.0)
 }}}
 and now:
 {{{
 /opt/local/lib/libgcc/libstdc++.6.dylib (compatibility version 7.0.0,
 current version 7.20.0)
 }}}

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Ticket URL: <https://trac.macports.org/ticket/43222#comment:28>
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