debian/control: remove dh-systemd build-depend

Related: OS#5223
Change-Id: I90c4723034a7fcd29421ef825b958dbdbb594dc2
diff --git a/debian/control b/debian/control
index e630326..9098678 100644
--- a/debian/control
+++ b/debian/control
@@ -8,7 +8,6 @@
                libosmocore-dev,
                libosmo-sccp-dev,
                dh-autoreconf,
-               dh-systemd (>= 1.5),
                libsnmp-dev,
                libsctp-dev
 Standards-Version: 3.9.6