Add libsystemd dependency if we have systemd in DISTRO_FEATURES.
This is needed to build the systemd backend. Projects that use seatd
to hook into logind (e.g. wlroots) fail to properly login without it.
(From OE-Core rev: c659e7468686b8f6995cdc01dd0dbe0e84946bf6)
Signed-off-by: Markus Volk <f_l_k@t-online.de>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>