core180: Ship json-c

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

diff --git a/config/rootfiles/core/180/filelists/json-c b/config/rootfiles/core/180/filelists/json-c
new file mode 120000 (symlink)
index 0000000..2da263e
--- /dev/null
+++ b/config/rootfiles/core/180/filelists/json-c
@@ -0,0 +1 @@
+../../../common/json-c
\ No newline at end of file