add missing --with systemd to dh

debian/rules

@@ -21,7 +21,7 @@ export PYBUILD_NAME=authserv
 PAM_INST_DIR = $(CURDIR)/debian/tmp/lib/$(DEB_HOST_MULTIARCH)/security
 
 %:
-	dh $@ --with python2 --buildsystem=python_distutils
+	dh $@ --with python2 --with systemd --buildsystem=python_distutils
 
 override_dh_auto_build:
 	(cd pam && ./autogen.sh && ./configure --prefix=/usr --with-pam-dir=/lib/$(DEB_HOST_MULTIARCH)/security && make)