accountsservice: Install systemd service unit

To enable/detect systemd libsystemd 186 is required. So, install the
systemd service unit ourselves.

Install it under `/lib`, as it’s the distributed file.

accountsservice.be0

@@ -67,6 +67,27 @@ mee_configure() {
 #}
 ## by default this may be 'make install DESTDIR="${D}"'
 
+mee_install_post() {
+    mkdir -p ${D}/lib/systemd/system/
+    cat > ${D}/lib/systemd/system/accounts-daemon.service <<-EOF
+	[Unit]
+	Description=Accounts Service
+
+	[Service]
+	Type=dbus
+	BusName=org.freedesktop.Accounts
+	ExecStart=${LIBEXECDIR}/accounts-daemon
+	StandardOutput=syslog
+
+	[Install]
+	# We pull this in by graphical.target instead of waiting for the bus
+	# activation, to speed things up a little: gdm uses this anyway so it is nice
+	# if it is already around when gdm wants to use it and doesn't have to wait for
+	# it.
+	WantedBy=graphical.target
+EOF
+}
+
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 ## Additional hints: