This is recommended by various Linux hardening guides in order to
prevent accidential overwriting of existing core dumps. While it has
probably little to no relevance to the average IPFire user, enabling it
won't harm and fixes a Lynis warning. :-)
Signed-off-by: Peter Müller <peter.mueller@ipfire.org>
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>