Remove preloading libsafe.

libsafe has been used to protect against string (printf)
formatting errors that could be a security threat.
This is not needed anymore because glibc does it on its own.

config/rootfiles/core/65/update.sh

@@ -169,6 +169,9 @@ if [ -e /var/ipfire/qos/enable ]; then
 	/usr/local/bin/qosctrl start
 fi
 
+# Remove preloading libsafe.
+rm -f /etc/ld.so.preload
+
 #
 # Modify grub.conf
 #