[net-dns/bind] bump from gentoo pr

net-dns/bind/files/generate-rndc-key.sh

@@ -0,0 +1,7 @@
+#!/bin/bash
+
+if [ ! -s /etc/bind/rndc.key ]; then
+    /usr/sbin/rndc-confgen -a > /dev/null 2>&1 || exit 1
+    chmod 640 /etc/bind/rndc.key
+    chown root.named /etc/bind/rndc.key
+fi