This aligns the fix for large number of RRs in RRSet with 9.18 and up
by backporting to `max-records-per-type` configuration option to
BIND 9.16.
Merge branch 'ondrej/max-records-per-type-backport-9.16' into 'bind-9.16'
See merge request isc-projects/bind9!9177
Remove also custom environment feature, which is not necessary with
proper config options backported.
Increase rightmost version to become higher than _4 suffix.
Resolves: RHEL-49900
