Core Update 170: Ship zlib

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

diff --git a/config/rootfiles/core/170/filelists/zlib b/config/rootfiles/core/170/filelists/zlib
new file mode 120000 (symlink)
index 0000000..e345663
--- /dev/null
+++ b/config/rootfiles/core/170/filelists/zlib
@@ -0,0 +1 @@
+../../../common/zlib
\ No newline at end of file