fixed compilation failure on hpux

the problem is that client tools are compiled with UNDEF_THREADS_HACK
flag, and my thread-related additions to the mysqltest.c can't be compiled.
Easy solution is to disable these in not-embedded case completely.

client/mysqltest.c

@@ -223,11 +223,13 @@ struct st_connection
   char *name;
   MYSQL_STMT* stmt;
 
+#ifdef EMBEDDED_LIBRARY
   const char *cur_query;
   int cur_query_len;
   pthread_mutex_t mutex;
   pthread_cond_t cond;
   int query_done;
+#endif /*EMBEDDED_LIBRARY*/
 };
 struct st_connection connections[128];
 struct st_connection* cur_con, *next_con, *connections_end;