bind: upgrade 9.18.20 -> 9.18.21

bind-ensure-searching-for-json-headers-searches-sysr.patch
refreshed for 9.18.21

Changelog:
==========
-Improve LRU cleaning behaviour.
-The "resolver-nonbackoff-tries" and "resolver-retry-interval" options are
 deprecated; a warning will be logged if they are used.
-BIND might sometimes crash after startup or re-configuration when one 'tls'
 entry is used multiple times to connect to remote servers due to initialisation
 attempts from contexts of multiple threads. That has been fixed.
-Dig +yaml will now report "no servers could be reached" also for UDP setup
 failure when no other servers or tries are left.
-Recognize escapes when reading the public key from file.
-Dig +yaml will now report "no servers could be reached" on TCP connection
 failure as well as for UDP timeouts.
-Deprecate AES-based DNS cookies.

(From OE-Core rev: b750d54622a0fa0a35d83ddc59f07661e903360b)

Signed-off-by: Wang Mingyu <wangmy@fujitsu.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-connectivity/bind/bind/bind-ensure-searching-for-json-headers-searches-sysr.patch

@@ -1,4 +1,4 @@
-From 246087f89e9434b726c7884e4c0964f71084f091 Mon Sep 17 00:00:00 2001
+From 5ae30329f168c1e8d2e0c3831988a4f3e9096e39 Mon Sep 17 00:00:00 2001
 From: Paul Gortmaker <paul.gortmaker@windriver.com>
 Date: Tue, 9 Jun 2015 11:22:00 -0400
 Subject: [PATCH] bind: ensure searching for json headers searches sysroot
@@ -33,10 +33,10 @@ Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
  1 file changed, 1 insertion(+), 1 deletion(-)
 
 diff --git a/configure.ac b/configure.ac
-index 10e8bf6..bf20690 100644
+index 2ab8ddd..92fe983 100644
 --- a/configure.ac
 +++ b/configure.ac
-@@ -814,7 +814,7 @@ AS_CASE([$with_lmdb],
+@@ -761,7 +761,7 @@ AS_CASE([$with_lmdb],
  	[no],[],
  	[auto|yes], [PKG_CHECK_MODULES([LMDB], [lmdb],
  				       [ac_lib_lmdb_found=yes],

meta/recipes-connectivity/bind/bind_9.18.21.bb

@@ -20,7 +20,7 @@ SRC_URI = "https://ftp.isc.org/isc/bind9/${PV}/${BPN}-${PV}.tar.xz \
            file://0001-avoid-start-failure-with-bind-user.patch \
            "
 
-SRC_URI[sha256sum] = "4b891ebf58d3f2a7ac3dd2682990f528a3448eaa1c992ddc5c141b8587a98ec5"
+SRC_URI[sha256sum] = "a556be22505d9ea4f9c6717aee9c549739c68498aff3ca69035787ecc648fec5"
 
 UPSTREAM_CHECK_URI = "https://ftp.isc.org/isc/bind9/"
 # follow the ESV versions divisible by 2