package/refpolicy: enable systemd support

This patch enables systemd support in the refpolicy by turning on the
'SYSTEMD' policy build option when systemd is enabled in Buildroot. This
enables conditional rules in SELinux policy modules (by defining
'init_systemd'), to better support systemd.

Signed-off-by: Antoine Tenart <antoine.tenart@bootlin.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/refpolicy/refpolicy.mk

@@ -29,11 +29,18 @@ REFPOLICY_POLICY_VERSION = $(BR2_PACKAGE_LIBSEPOL_POLICY_VERSION)
 REFPOLICY_POLICY_STATE = \
 	$(call qstrip,$(BR2_PACKAGE_REFPOLICY_POLICY_STATE))
 
+ifeq ($(BR2_INIT_SYSTEMD),y)
+define REFPOLICY_CONFIGURE_SYSTEMD
+	$(SED) "/SYSTEMD/c\SYSTEMD = y" $(@D)/build.conf
+endef
+endif
+
 define REFPOLICY_CONFIGURE_CMDS
 	$(SED) "/OUTPUT_POLICY/c\OUTPUT_POLICY = $(REFPOLICY_POLICY_VERSION)" \
 		$(@D)/build.conf
 	$(SED) "/MONOLITHIC/c\MONOLITHIC = y" $(@D)/build.conf
 	$(SED) "/NAME/c\NAME = targeted" $(@D)/build.conf
+	$(REFPOLICY_CONFIGURE_SYSTEMD)
 endef
 
 define REFPOLICY_BUILD_CMDS