Install systemd services with autotools

Change-Id: I7e4dae6b8c1685e8a673c58a843c41fa0af1b35c
diff --git a/Makefile.am b/Makefile.am
index 3270e4f..1497f80 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -24,6 +24,9 @@
 BUILT_SOURCES = $(top_srcdir)/.version
 EXTRA_DIST = git-version-gen osmoappdesc.py .version
 
+DISTCHECK_CONFIGURE_FLAGS = \
+	--with-systemdsystemunitdir=$$dc_install_base/$(systemdsystemunitdir)
+
 @RELMAKE@
 
 $(top_srcdir)/.version: