Core Update 163: Ship Squid 4.16

Since the patches for Squid 5.x are still awaiting some feedback
regarding the number of file descriptors, shipping the latest version of
Squid's 4.x branch is a reasonable interim solution to have known bugs
and security vulnerabilities covered.

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

diff --git a/config/rootfiles/core/163/filelists/squid b/config/rootfiles/core/163/filelists/squid
new file mode 120000 (symlink)
index 0000000..2dc8372
--- /dev/null
+++ b/config/rootfiles/core/163/filelists/squid
@@ -0,0 +1 @@
+../../../common/squid
\ No newline at end of file