Add sysroot path option to ade configure

The handler is already present since the info and sysroot subcommand
are already having a --path parameter.

Signed-off-by: Frédéric Dalleau <frederic.dalleau@collabora.com>
Reviewed-by: Emanuele Aina <emanuele.aina@collabora.com>
Differential Revision: https://phabricator.apertis.org/D6412