The common convention of passing "--" as a separator between
arguments for this command and arguments for the wrapped command
did not work, because it would also pass the "--" through. For
instance, "ade configure --native -- --device=foo" should pass
"--device=foo" to the configure script instead of interpreting it
as ade's own --device option.

Signed-off-by: Simon McVittie <smcv@collabora.com>
Reviewed-by: André Magalhães <andre.magalhaes@collabora.co.uk>
Differential Revision: https://phabricator.apertis.org/D6796