Fix for https://bugs.launchpad.net/maria/+bug/509795

Result of reverse_lookup("localhost") is system depended.
Therefore we disable the result of it.

mysql-test/r/udf.result

@@ -38,8 +38,6 @@ ERROR HY000: Can't initialize function 'reverse_lookup'; Wrong number of argumen
 select reverse_lookup("127.0.0.1");
 select reverse_lookup(127,0,0,1);
 select reverse_lookup("localhost");
-reverse_lookup("localhost")
-NULL
 select avgcost();
 ERROR HY000: Can't initialize function 'avgcost'; wrong number of arguments: AVGCOST() requires two arguments
 select avgcost(100,23.76);

mysql-test/t/udf.test

@@ -56,9 +56,9 @@ select reverse_lookup();
 --disable_result_log
 select reverse_lookup("127.0.0.1");
 select reverse_lookup(127,0,0,1);
+select reverse_lookup("localhost");
 --enable_result_log
 
-select reverse_lookup("localhost");
 --error ER_CANT_INITIALIZE_UDF
 select avgcost();
 --error ER_CANT_INITIALIZE_UDF