mkv: matroska_segment_parse.cpp c-style cast => c++ cast
mkv: matroska_segment_parse.cpp c-style cast => c++ cast

Signed-off-by: Jean-Baptiste Kempf <7b85a41a628204b76aba4326273a3ccc74bd009a@videolan.org>

xkfz007/vlc,xkfz007/vlc,xkfz007/vlc,xkfz007/vlc,xkfz007/vlc,xkfz007/vlc,xkfz007/vlc