Ensure isc_rwlocktype_t is defined always

Prevent issues in compilation after dns/zt.h change.

bind-9.18-zt-include-rwlock.patch

@@ -0,0 +1,27 @@
+From 395d6fca2638129e1cc1f55ee4b3aa0dbba44dc0 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Petr=20Men=C5=A1=C3=ADk?= <pemensik@redhat.com>
+Date: Mon, 16 Jan 2023 11:45:31 +0100
+Subject: [PATCH] Include isc_rwlocktype_t type definition in zt.h
+
+After changes zt.h uses rwlock type, which is not enforced to be always
+defined. Ensure full type definition is ready by including appropriate
+header.
+---
+ lib/dns/include/dns/zt.h | 1 +
+ 1 file changed, 1 insertion(+)
+
+diff --git a/lib/dns/include/dns/zt.h b/lib/dns/include/dns/zt.h
+index 077b26ddea..037d0a9495 100644
+--- a/lib/dns/include/dns/zt.h
++++ b/lib/dns/include/dns/zt.h
+@@ -18,6 +18,7 @@
+ #include <stdbool.h>
+ 
+ #include <isc/lang.h>
++#include <isc/rwlock.h>
+ 
+ #include <dns/types.h>
+ 
+-- 
+2.39.0
+

bind.spec

@@ -101,6 +101,8 @@ Patch16: bind-9.16-redhat_doc.patch
 Patch22: bind-9.11-fips-tests.patch
 # https://bugzilla.redhat.com/show_bug.cgi?id=2122010
 Patch26: bind-9.18-unittest-netmgr-unstable.patch
+# https://gitlab.isc.org/isc-projects/bind9/-/merge_requests/7376/
+Patch27: bind-9.18-zt-include-rwlock.patch
 
 %{?systemd_ordering}
 Requires:       coreutils
@@ -951,6 +953,7 @@ fi;
 %changelog
 * Mon Jan 16 2023 Petr Menšík <pemensik@redhat.com> - 32:9.18.10-1
 - Update to 9.18.10 (#2143258)
+- Include rwlock.h from dns/zt.h
 
 * Mon Nov 21 2022 Petr Menšík <pemensik@redhat.com> - 32:9.18.9-1
 - Update to 9.18.9 (#2143258)