add systemd stuff for dist

dist/PKGBUILD

@@ -66,6 +66,6 @@ package() {
     install -Dm644 "$srcdir/crossfire/etc/crossfire.rktd" "$pkgdir/etc/crossfire.rktd"
     # install tmpfiles and sysusers for systemd
     # install server systemd service
-    echo todo
-    return -1
+    install -Dm644 "$srcdir/crossfire/dist/sysusers.conf" "$pkgdir/usr/lib/sysusers.d/crossfire.conf"
+    install -Dm644 "$srcdir/crossfire/dist/crossfire.service" "$pkgdir/usr/lib/systemd/system/crossfire.service"
 }

dist/crossfire.service

@@ -0,0 +1,12 @@
+[Unit]
+Description=Crossfire server
+After=network-online.target
+Wants=network-online.target
+
+[Service]
+Type=simple
+User=crossfire
+ExecStart=/usr/bin/crossfire-server
+
+[Install]
+WantedBy=multi-user.target

dist/sysusers.conf

@@ -0,0 +1 @@
+u crossfire - "Crossfire server user" /var/lib/crossfire/