Add updated ddns to core 104.

Signed-off-by: Stefan Schantl <stefan.schantl@ipfire.org>

diff --git a/config/rootfiles/core/104/filelists/ddns b/config/rootfiles/core/104/filelists/ddns
new file mode 120000 (symlink)
index 0000000..7395164
--- /dev/null
+++ b/config/rootfiles/core/104/filelists/ddns
@@ -0,0 +1 @@
+../../../common/ddns
\ No newline at end of file