Log Message:
net/nsd: Update to 4.9.1

Changelog:
4 April 2024: Jeroen
	- Use rooted temporary path in makedist.sh.
	- Tag for 4.9.1.

3 April 2024: Jeroen
	- Replace multiple strcat and strcpy by snprintf.
	- Tag for 4.9.0.

26 March 2024: Jeroen
	- Test if debug is available in do-tests.
	- Enforce timeout from NSD in ixfr_gone test.
	- Update expressions in ixfr_and_restart test.
	- Make algorithm explicit in control-repattern test.
	- Switch algorithm to hmac-256 for testplan_mess test.
	- Tag for 4.9.0rc1.

25 March 2024: Jeroen
	- Fix timing sensitivity in ixfr_outsync test.

22 March 2024: Jeroen
	- Set up doc/RELNOTES for upcoming release.

26 February 2024: Willem
	- Merge #316: Fix to reap defunct children by the reload process that
	  emerged when some serve child processes were still serving TCP
	  request while the others had already quit, while the reload process
	  was waiting for the signal from the backup/old main process that all
	  children exited.
	- Fix (also from Merge #316) to reap exited children more frequently
	  from server main loop for processes that exited during reload, but
	  missed the initial reaping at start of the main loop because they
	  took somewhat longer to exit.

16 February 2024: Wouter
	- Fix compile with memclean for xfrd nsd.db close.
	- In xfrd del secondary zone, the timer could perhaps have
	  event_added, and if so, it would not be event_del if a tcp connection
	  is active at the time. This could cause the libevent event lists
	  to fail. Also fix to make sure to set event_added for the
	  nsd-control ssl nonblocking handshake and check event_added there
	  too, for extra certainty.

15 February 2024: Willem
	- Merge #304: Support for Catalog zones version "2" as specified in
	  RFC 9432. Both the consumer as well as the producer role are
	  implemented, but only a single catalog consumer zone is allowed.
	  The "coo" property, only relevant with multiple catalog consumer,
	  is therefore not supported. The "group" property is supported.
	  Have a look at the nsd.conf man page for details on how to
	  configure and use catalog zones.

12 February 2024: Willem
	- Allow SOA apex queries to otherwise with allow-query protected zones
	  for clients matching a provide-xfr rule, because clients that are
	  allowed to transfer the zone need to be able to query SOA at the
	  apex preceding the actual transfer.

6 February 2024: Wouter
	- Fix #313: nsd 4.8 stats with implausible spikes.

16 January 2024: Wouter
	- Move acx_nlnetlabs.m4 to version 48, with ssp and getaddrinfo
	  include check.

14 January 2024: Wouter
	- Move acx_nlnetlabs.m4 to version 47, with crypt32 check.

8 December 2023: Wouter
	- Merge #309: More RFC 8499 compliance.
	- Fix #310: NSD stats contain the terms "master" and "slave".
	- Fix control-reconfig-xfrd test for zonestatus primary that is
	  printed by nsd-control zonestatus.

7 December 2023: Wouter
	- Merge #307 from anandb-ripencc: Many improvements to the nsd.conf
	  man page.
	- Fix #308: Deprecate "multi-master-check" in favour of
	  "multi-primary-check".

6 December 2023: Wouter
	- Fix to sync the tests script file common.sh.
	- Update test script file common.sh.
	- Fix #306: Missing AC_SUBST(dbdir) breaks installation with 4.8.0.
	- Fix for #306: Create directory for xfrd.state and zone.list files
	  in make install.