Core Update 166: Ship rrdtool

Signed-off-by: Peter Müller <peter.mueller@ipfire.org>

diff --git a/config/rootfiles/core/166/filelists/rrdtool b/config/rootfiles/core/166/filelists/rrdtool
new file mode 120000 (symlink)
index 0000000..7a82e41
--- /dev/null
+++ b/config/rootfiles/core/166/filelists/rrdtool
@@ -0,0 +1 @@
+../../../common/rrdtool
\ No newline at end of file