For details see:
https://downloads.isc.org/isc/bind9/9.11.21/RELEASE-NOTES-bind-9.11.21.html
"Bug Fixes
named could crash when cleaning dead nodes in lib/dns/rbtdb.c that
were being reused. [GL #1968]
Properly handle missing kyua command so that make check does not
fail unexpectedly when CMocka is installed, but Kyua is not. [GL
#1950]
The validator could fail to accept a properly signed RRset if an
unsupported algorithm appeared earlier in the DNSKEY RRset than
a supported algorithm. It could also stop if it detected a malformed
public key. [GL #1689]"
Signed-off-by: Matthias Fischer <matthias.fischer@ipfire.org> Reviewed-by: Michael Tremer <michael.tremer@ipfire.org> Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>