dnsmasq-devel: add test release 2.85rc1

This is to fix a port randomization flaw that subjects dnsmasq to a cache poisoning attack.

ChangeLog:
https://thekelleys.org.uk/gitweb/?p=dnsmasq.git;a=blob;f=CHANGELOG;h=155fc966f9542259596b41594f4b85775d1f9c9a;hb=023ace8e54c2e83e88082a1073a281d659f2a860#l1

Add CONFLICTS_INSTALL markers.

Security: CVE-2021-3448
Security: 5b72b1ff-877c-11eb-bd4f-2f1d57dafe46