Now we have the start of a PEP-517 base class, the PEP517_SOURCE_PATH
variable can be defined in there instead of the classes that use it.
(From OE-Core rev: 69944121f49f613568bf0c62ae6b3b47af195dbe)
Signed-off-by: Ross Burton <ross.burton@arm.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>