package/kodi: security bump to version 17.3

Release notes:
https://kodi.tv/article/kodi-v173-minor-bug-fix-and-security-release

"Fix possible security flaw which could abused .zip files which try to
 traverse to a parent directory"

For details about the security bug refer to
http://blog.checkpoint.com/2017/05/23/hacked-in-translation/



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