package/bind: ignore CVE-2019-6470

package/bind: ignore CVE-2019-6470

There had existed in one of the ISC BIND libraries a bug in a
function that was used by dhcpd when operating in DHCPv6 mode.
There was also a bug in dhcpd relating to the use of this function
per its documentation, but the bug in the library function
prevented this from causing any harm. All releases of dhcpd from
ISC contain copies of this, and other, BIND libraries in
combinations that have been tested prior to release and are known
to not present issues like this.

Affects: Builds of dhcpd versions prior to version 4.4.1 when
using BIND versions 9.11.2 or later.

https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-6470

Signed-off-by: Matthew Weber <matthew.weber@rockwellcollins.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>