package/avahi: add upstream security fix

package/avahi: add upstream security fix

Fixes CVE-2017-6519: avahi-daemon in Avahi through 0.6.32 and 0.7
inadvertently responds to IPv6 unicast queries with source addresses
that are not on-link, which allows remote attackers to cause a denial
of service (traffic amplification) and may cause information leakage
by obtaining potentially sensitive information from the responding
device via port-5353 UDP packets.

Signed-off-by: Artem Panfilov <panfilov.artyom@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>