Add CHANGES entry

5050.	[bug]		The libirs version of getaddrinfo() was unable to parse
			scoped IPv6 addresses present in /etc/resolv.conf.
			[GL #187]

(cherry picked from commit b7564cc8)
15 jobs for 187-libirs-handle-scoped-ipv6-addresses-in-etc-resolv.conf-v9_12 in 7 minutes and 48 seconds (queued for 6 seconds)