[MacPorts] #40231: mkvtoolnix: fix build with clang

[MacPorts]

#40231: mkvtoolnix: fix build with clang
---------------------------+--------------------------------
  Reporter:  ryandesign@…  |      Owner:  macports-tickets@…
      Type:  enhancement   |     Status:  new
  Priority:  Normal        |  Milestone:
 Component:  ports         |    Version:  2.2.0
Resolution:                |   Keywords:
      Port:  mkvtoolnix    |
---------------------------+--------------------------------

Comment (by ecronin@…):

 Also, didn't report either of those compilation errors/fixes upstream...
 figured should wait until it builds and can be tested first.

-- 
Ticket URL: <https://trac.macports.org/ticket/40231#comment:13>
MacPorts <http://www.macports.org/>
Ports system for OS X