Always generate gdnsd.service

Some packaging systems that are systemd-aware might deal with
things better if "make install" doesn't install the unit file.
This gives them the option to use --without-systemdsystemunitdir
to avoid installation, but still have a generated unit file at a
known path in the build tree to pick up with their own tools.

INSTALL

@@ -41,10 +41,10 @@ Interesting / Non-standard autoconf options
     autoconf's prefix at all; it will still pick e.g.
     "/usr/lib/systemd/system" even when --prefix is "/usr/local".
   If pkg-config and/or systemd do not exist and this is not set manually
-    the unit file is neither generated nor installed.
-  To disable the generation and installation of the unit file on systems
-    which have systemd software installed (but e.g. are not using it for
-    the init system), use --without-systemdsystemunitdir.
+    the unit file is generated, but not installed.
+  To disable the installation of the unit file on systems which have
+    systemd software installed (but e.g. are not using it for the init
+    system), use --without-systemdsystemunitdir
 
 --without-urcu
   Explicitly disable support for liburcu (falls back to pthread rwlocks)

sysd/Makefile.am

@@ -1,13 +1,13 @@
 EXTRA_DIST = gdnsd.service.tmpl
 
-if DO_SYSD_UNITFILE
-
 gdnsd.service: gdnsd.service.tmpl
 	$(AM_V_GEN)sed 's|@GDNSD_SBINDIR[@]|$(sbindir)|g' <$< >$@
 
 clean-local:
 	rm -f $(builddir)/gdnsd.service
 
+if DO_SYSD_UNITFILE
+
 systemdsystemunit_DATA = gdnsd.service
 
 install-exec-hook:
@@ -21,4 +21,8 @@ install-exec-hook:
 	@echo systemctl start gdnsd
 	@echo
 
+else
+
+noinst_SCRIPTS = gdnsd.service
+
 endif