Make the hook systemd compatible

sd-welcomemessage.install

@@ -0,0 +1,11 @@
+# vim:ft=sh
+
+build() {
+	cat $(cat /etc/welcomemessage.conf | sed -n '/filename=/p' | sed 's/filename=//') > "$BUILDROOT/welcomemessage"
+	add_systemd_unit "welcomemessage.service"
+}
+help() {
+cat<<HELPEOF
+	This hook will print a welcome message before the encryption password is required
+HELPEOF
+}