Log Message:
net/bind912: update to 9.12.4pl1

Update bind912 to 9.12.4pl1 (BIND 9.12.4-P1).

Fix security problem CVE-2018-5743 and CVE-2019-6467 and overhaul pkgsrc.
Now no need to change namedb is permission under NetBSD.

pkgsrc changes:

* Simplify DESCR.
* Update note about required directories.
* Drop pkg-config from USE_TOOLS.
* Drop none existing configure arguments and PKG_OPTIONS:
	- fetchlimit
	- sit
* Sort PLIST.

Please refer CHANGES file in detail before 9.12.4 release:

	--- 9.12.4-P1 released ---

5200.	[security]	tcp-clients settings could be exceeded in some cases,
			which could lead to exhaustion of file descriptors.
			(CVE-2018-5743) [GL #615]

5199.	[security]	In certain configurations, named could crash
			if nxdomain-redirect was in use and a redirected
			query resulted in an NXDOMAIN from the cache.
			(CVE-2019-6467) [GL #880]

5167.	[bug]		nxdomain-redirect could sometimes lookup the wrong
			redirect name. [GL #892]