libtools-cross/shadow-sysroot: Use nopackages inherit
When testing pseudo changes I realised these recipes have packaging tasks
but don't generate packages. Drop the packages tasks for cleanliness.
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit ef9c11797b5d626bdb40b4509d8b2b0d461ff9ea)
Signed-off-by: Steve Sakoman <steve@sakoman.com>