Fix for #2208 (multi-query returns wrong result in embedded library)

now we execute only one first select during mysql_real_query
others - during 'mysql_next_result'

sql/sql_class.h

@@ -565,6 +565,8 @@ public:
   struct st_mysql_bind *client_params;
   char *extra_data;
   ulong extra_length;
+  char *query_rest;
+  uint32 query_rest_length;
 #endif
   NET	  net;				// client connection descriptor
   MEM_ROOT warn_root;			// For warnings and errors