package/kodi: drop readline dependency

{python-,}readline is (no longer) a required dependency of kodi, and
readline (GPL-3.0+) is not license compatible with kodi (GPL-2.0), so drop
the dependency.

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>