Changelog:
============
* Remove various unused imports.
* Fix build backend. This should prevent version from being set to 0.0.0
when building wheels.
(From OE-Core rev: a6c46a0074999d9460f273886734258f0bf788d2)
Signed-off-by: Wang Mingyu <wangmy@fujitsu.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
