A backport of the `yield from` semantic from Python 3.x to Python 2.7.
Can be useful for both host and target packages.
Signed-off-by: Asaf Kahlon <asafka7@gmail.com>
Reviewed-by: Yegor Yefremov <yegorslists@googlemail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
