Fixed sys_vars.log_error_func, sys_vars.log_error_func2,
maria.small_blocksize, sys_vars.autocommit_func3, sys_vars.autocommit_func2,
sys_vars.autocommit_func4, sys_vars.autocommit_func5,
sys_vars.tx_isolation_func, main.pool_of_threads, innodb.innodb,
archive.archive-big, parts.part_supported_sql_func_innodb,
parts.partition_decimal_myisam, parts.partition_decimal_innodb,
main.sum_distinct-big, percona.innodb_sys_index,
percona.percona_flush_contiguous_neighbors failures.

libmysqld/lib_sql.cc:
  Restore proper method to retrieve warnings number.