core185: Ship libffi

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

diff --git a/config/rootfiles/core/185/filelists/libffi b/config/rootfiles/core/185/filelists/libffi
new file mode 120000 (symlink)
index 0000000..c391acd
--- /dev/null
+++ b/config/rootfiles/core/185/filelists/libffi
@@ -0,0 +1 @@
+../../../common/libffi
\ No newline at end of file