devtool doesn't quite behave right when a recipe has patches applied in overrides, so
add a test case to exercise that behaviour.
(From OE-Core rev: ad89c3254cc6c06026f1bebe23ec3717c1546633)
Signed-off-by: Ross Burton <ross.burton@arm.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>