Don't install systemd unit

There is no need to install the systemd unit since Evince is not
a daemon and can be dbus-activated.

evince.spec

@@ -132,6 +132,7 @@ autoreconf -f -i
 %endif
         --enable-xps=yes \
         --enable-t1lib=no \
+        --without-systemduserunitdir \
         --enable-ps=yes
 make %{?_smp_mflags} V=1 LIBTOOL=/usr/bin/libtool
 
@@ -180,7 +181,6 @@ desktop-file-validate $RPM_BUILD_ROOT%{_datadir}/applications/org.gnome.Evince-p
 %{_datadir}/GConf/gsettings/evince.convert
 %{_datadir}/metainfo/org.gnome.Evince.appdata.xml
 %{_datadir}/thumbnailers/evince.thumbnailer
-%{_userunitdir}/org.gnome.Evince.service
 
 %files libs
 %doc NEWS AUTHORS