MySQL 8.0.20 client library has fixed reinitialization bug

Adjust workaround for affected MySQL client versions which prevents
cleaning up of MySQL client resources.

dbdimp.c

@@ -3098,6 +3098,7 @@ static void mariadb_dr_close_mysql(pTHX_ imp_drh_t *imp_drh, MYSQL *pmysql)
      * - infinite loop when calling mysql_server_end() more then once in case Embedded server was not started
      * Therefore do not call mysql_server_end() when Embedded server was not in used.
      * These bugs were fixed in MariaDB Connector/C 3.0.5, see: https://jira.mariadb.org/browse/CONC-336
+     * And fixed also in MySQL 8.0.20, see: https://bugs.mysql.com/bug.php?id=93276
      * But remains in MariaDB Embedded server, see: https://jira.mariadb.org/browse/MDEV-16578
      */
 #if !defined(HAVE_BROKEN_INIT) && (defined(HAVE_DEINITIALIZE_SSL) || !defined(HAVE_PROBLEM_WITH_OPENSSL))

dbdimp.h

@@ -373,9 +373,9 @@ PERL_STATIC_INLINE unsigned long mariadb_get_client_version(void)
 /*
  * MySQL and MariaDB Embedded are affected by https://jira.mariadb.org/browse/MDEV-16578
  * MariaDB 10.2.2+ prior to 10.2.19 and 10.3.9 and MariaDB Connector/C prior to 3.0.5 are affected by https://jira.mariadb.org/browse/CONC-336
- * MySQL 8.0.4+ is affected too by https://bugs.mysql.com/bug.php?id=93276
+ * MySQL 8.0.4+ prior to 8.0.20 is affected too by https://bugs.mysql.com/bug.php?id=93276
  */
-#if defined(HAVE_EMBEDDED) || (!defined(MARIADB_BASE_VERSION) && MYSQL_VERSION_ID >= 80004) || (defined(MARIADB_PACKAGE_VERSION) && (!defined(MARIADB_PACKAGE_VERSION_ID) || MARIADB_PACKAGE_VERSION_ID < 30005)) || (defined(MARIADB_BASE_VERSION) && ((MYSQL_VERSION_ID >= 100202 && MYSQL_VERSION_ID < 100219) || (MYSQL_VERSION_ID >= 100300 && MYSQL_VERSION_ID < 100309)))
+#if defined(HAVE_EMBEDDED) || (!defined(MARIADB_BASE_VERSION) && MYSQL_VERSION_ID >= 80004 && MYSQL_VERSION_ID < 80020) || (defined(MARIADB_PACKAGE_VERSION) && (!defined(MARIADB_PACKAGE_VERSION_ID) || MARIADB_PACKAGE_VERSION_ID < 30005)) || (defined(MARIADB_BASE_VERSION) && ((MYSQL_VERSION_ID >= 100202 && MYSQL_VERSION_ID < 100219) || (MYSQL_VERSION_ID >= 100300 && MYSQL_VERSION_ID < 100309)))
 #define HAVE_BROKEN_INIT
 #endif