Added two possible error cases for a test.

mysql-test/r/wait_timeout.result:
  Added two possible error cases for a test. Depending
  on a platform, either errno can occur and is correct.
  
  Possible errors are CR_SERVER_GONE_ERROR and
  CR_SERVER_LOST
mysql-test/t/wait_timeout.test:
  Added two possible error cases for a test. Depending
  on a platform, either errno can occur and is correct.
  
  Possible errors are CR_SERVER_GONE_ERROR and
  CR_SERVER_LOST

mysql-test/r/wait_timeout.result

@@ -6,7 +6,7 @@ select 1;
 1
 1
 select 2;
-ERROR HY000: MySQL server has gone away
+Got one of the listed errors
 select 3;
 3
 3
@@ -14,7 +14,7 @@ select 1;
 1
 1
 select 2;
-ERROR HY000: MySQL server has gone away
+Got one of the listed errors
 select 3;
 3
 3

mysql-test/t/wait_timeout.test

@@ -46,7 +46,8 @@ while (!`select @aborted_clients`)
 connection default;
 # When the connection is closed in this way, the error code should
 # be consistent see bug#2845 for an explanation
---error 2006
+# depending on platform/client, either errno 2006 or 2013 can occur below
+--error 2006,2013
 select 2;
 --enable_reconnect
 select 3;
@@ -90,7 +91,8 @@ while (!`select @aborted_clients`)
 connection con1;
 # When the connection is closed in this way, the error code should
 # be consistent see bug#2845 for an explanation
---error 2006
+# depending on platform/client, either errno 2006 or 2013 can occur below
+--error 2006,2013
 select 2;
 --enable_reconnect
 select 3;