core121: Ship updated libidn

Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>

diff --git a/config/rootfiles/core/121/filelists/libidn b/config/rootfiles/core/121/filelists/libidn
new file mode 120000 (symlink)
index 0000000..7e35489
--- /dev/null
+++ b/config/rootfiles/core/121/filelists/libidn
@@ -0,0 +1 @@
+../../../common/libidn
\ No newline at end of file