dns/dnsmasq-devel: update to v2.86test7

Changes since test6, per Git, without merges, and by Simon Kelley unless
noted otherwise:

• a1729de 2021-08-11 | Fiz sizeof() confusion in 527c3c7 (tag: v2.86test7)
• fc64b97 2021-08-10 | dhcp_buff2 not availble in log_packet, use daemon->addrbuff
• a163c63 2021-08-05 | CONNTRACK needs CAP_NET_ADMIN.
• 527c3c7 2021-08-10 | Remove remaining uses of deprecated inet_ntoa() [Petr Menšík]
• fcb4dca 2021-08-10 | Remove remaining uses of deprecated inet_addr() function. [Petr Menšík]
• 3ca4995 2021-08-10 | CHANGELOG: spell-check [Matthias Andree]
• d387f8f 2021-07-22 | Re-order UBus teardown logic. [Etan Kissling]
• ea43234 2021-08-10 | There was a notify variable to keep track whether a subscriber is observing our UBus object. However, it was not properly cleaned up in ubus_destroy, potentially becoming stale over UBus reconnections. The variable was removed and the current state is examined when sending notifications, similarly as is done in other existing OpenWrt code. [Etan Kissling]
• 867e56a 2021-08-08 | Fix NOERR/NXDOMAIN in answers configured by --domain-needed.