nginx: activate the systemd service

Signed-off-by: Aurélien Chabot <aurelien@chabot.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/nginx/nginx.mk

@@ -230,6 +230,11 @@ endef
 define NGINX_INSTALL_INIT_SYSTEMD
 	$(INSTALL) -D -m 0644 package/nginx/nginx.service \
 		$(TARGET_DIR)/usr/lib/systemd/system/nginx.service
+
+	mkdir -p $(TARGET_DIR)/etc/systemd/system/multi-user.target.wants
+
+	ln -fs ../../../../usr/lib/systemd/system/nginx.service \
+		$(TARGET_DIR)/etc/systemd/system/multi-user.target.wants/nginx.service
 endef
 
 define NGINX_INSTALL_INIT_SYSV