Explicitly disable systemd support so that it isn't a floating dependency and
libsystemd-login doesn't become a runtime dependency on non-systemd images.
Also don't bother setting the systemd unit directory as we're not installing
anything.
(From OE-Core rev: 4f5d00b551e2ee6056ebfc8365a05a5ca8e5d651)
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>