WL1019: complete patch. Reapplied patch to the clean

tree to get rid of multiple typos in CS comments and
unify the patch.

mysql-test/t/system_mysql_db.test

@@ -2,6 +2,10 @@
 # This test must examine integrity of system database "mysql"
 #
 
+# check that CSV engine was compiled in, as the result of the test
+# depends on the presence of the log tables (which are CSV-based).
+--source include/have_csv.inc
+
 # First delete some tables maybe left over from previous tests
 --disable_warnings
 drop table if exists t1,t1aa,t2aa;