buildroot

erlang-p1-xmpp: Bump to version 1.1.16

This packages now depends also on erlang-p1-utils.
Adapt the patch that removes rebar dependencies to version changes.

Signed-off-by: Johan Oudinet <johan.oudinet@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>