Install systemd services with autotools

Change-Id: I9bc40cf9e9a901d28d1f1629f6f1d55e8ba0c0b6
diff --git a/debian/osmocom-nitb.install b/debian/osmocom-nitb.install
index 26caf71..78e8f77 100644
--- a/debian/osmocom-nitb.install
+++ b/debian/osmocom-nitb.install
@@ -1,2 +1,3 @@
+/lib/systemd/system/osmo-nitb.service
 /usr/bin/osmo-nitb
-openbsc/contrib/*.py usr/bin/
\ No newline at end of file
+openbsc/contrib/*.py usr/bin/