poky: Enable yocto-space-optimize.inc
Switch poky to use the recently added include file which reduces the build
disk footprint, sstate object size and speeds the build slightly.
(From meta-yocto rev: 72c660865c29bf749dd5d9f632b227c97c454dae)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Richard Purdie