tmpfile support is optional in systemd but the dhcp server install it's
config file in $(TARGET_DIR)/usr/lib/tmpfiles.d directory when systemd
is used as init system.
So it seems that dhcp server require tmpfile support for systemd based
system.
Signed-off-by: Romain Naour <romain.naour@gmail.com>
Cc: Vicente Olivert Riera <Vincent.Riera@imgtec.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
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