cleanup:have_log_bin.inc

prefer if/skip over require
(works better with debugging, not affected by query log)

mysql-test/include/have_log_bin.inc

@@ -8,7 +8,6 @@
 
 source include/not_embedded.inc;
 
--- require include/have_log_bin.require
-disable_query_log;
-show variables like 'log_bin';
-enable_query_log;
+if (`select not @@log_bin`) {
+  skip Test requires: 'have_log_bin';
+}

mysql-test/include/have_log_bin.require

-Variable_name	Value
-log_bin	ON