libass decoder: use Helvetica-Neue instead of Arial as default font on Apple platforms
libass decoder: use Helvetica-Neue instead of Arial as default font on Apple platforms

Arial is not available on anything but OS X

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