mkv: replaced (manual) linked-list with std::vector in `matroska_segment_c::Seek`
mkv: replaced (manual) linked-list with std::vector in `matroska_segment_c::Seek`

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

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