Log Message:
net/bind912: update to 9.12.3pl4

Update bind912 to 9.12.3pl4 (BIND 9.12.3-P4).

	--- 9.12.3-P4 released ---

	--- 9.12.3-P3 released (withdrawn) ---

5141.	[security]	Zone transfer controls for writable DLZ zones were
			not effective as the allowzonexfr method was not being
			called for such zones. (CVE-2019-6465) [GL #790]

	--- 9.12.3-P2 released (withdrawn) ---

5118.	[security]	Named could crash if it is managing a key with
			`managed-keys` and the authoritative zone is rolling
			the key to an unsupported algorithm. (CVE-2018-5745)
			[GL #780]

5110.	[security]	Named leaked memory if there were multiple Key Tag
			EDNS options present. (CVE-2018-5744) [GL #772]