[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:  new
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:
Resolution:              |   Keywords:
      Port:  mkvtoolnix  |
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Comment (by mojca@…):

 Replying to [comment:15 pixilla@…]:
 > Replying to [comment:14 mojca@…]:
 >
 > > Also: any special reason for removing the patch for clang?
 >
 > It compiled without the patch.

 The [https://build.macports.org/builders/buildports-mavericks-
 x86_64/builds/4066 buildbot] seems to disagree:

 {{{
 In file included from src/common/command_line.cpp:14:
 In file included from src/common/common_pch.h:4:
 In file included from src/common/common.h:29:
 /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/../lib/c++/v1/vector:1900:21:
 fatal error: object of type 'boost::filter_iterator<<lambda at
 src/common/command_line.cpp:301:74>,
 boost::transform_iterator<boost::range_detail::select_first<std::__1::map<std::__1::basic_string<char>,
 std::__1::basic_string<char>, std::__1::less<std::__1::basic_string<char>
 >, std::__1::allocator<std::__1::pair<const std::__1::basic_string<char>,
 std::__1::basic_string<char> > > > >,
 std::__1::__map_const_iterator<std::__1::__tree_const_iterator<std::__1::__value_type<std::__1::basic_string<char>,
 std::__1::basic_string<char> >,
 std::__1::__tree_node<std::__1::__value_type<std::__1::basic_string<char>,
 std::__1::basic_string<char> >, void *> *, long> >, boost::use_default,
 boost::use_default> >' cannot be assigned because its copy assignment
 operator is implicitly deleted
                 __m = __first;
                     ^
 }}}

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Ticket URL: <https://trac.macports.org/ticket/43222#comment:22>
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