bind: update to 9.16.4

This update fixes the following CVE's:
- CVE-2020-8618
- CVE-2020-8619

More info on bug fixes and feature changes in:
https://downloads.isc.org/isc/bind9/9.16.4/doc/arm/html/notes.html

Signed-off-by: Tiago Gaspar <tiagogaspar8@gmail.com>

net/bind/Makefile

@@ -9,7 +9,7 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=bind
-PKG_VERSION:=9.16.3
+PKG_VERSION:=9.16.4
 PKG_RELEASE:=2
 USERID:=bind=57:bind=57
 
@@ -22,7 +22,7 @@ PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.xz
 PKG_SOURCE_URL:= \
 	https://www.mirrorservice.org/sites/ftp.isc.org/isc/bind9/$(PKG_VERSION) \
 	https://ftp.isc.org/isc/bind9/$(PKG_VERSION)
-PKG_HASH:=27ac6513de5f8d0db34b9f241da53baa15a14b2ad21338d0cde0826eaf564f7e
+PKG_HASH:=7522088d3daac8bcabaae37998178e09139ef5ccae6631cb1d8a625b770f370a
 
 PKG_FIXUP:=autoreconf
 PKG_REMOVE_FILES:=aclocal.m4 libtool.m4