package/kodi: Bump version to 14.0-Helix

- delete 0002-mathutil.patch, committed upstream
- delete 0003-dbus.patch, committed upstream
- add dependency to ffmpeg, xbmc does not deliver its own ffmpeg anymore
- remove dependency to flac & lame, audio encoders have been seperated from kodi

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>