Improve warning message about invalid class to classref or vice-versa conversion

compiler/msg/errore.msg

@@ -1873,8 +1873,6 @@ type_e_constant_expr_expected=04052_E_Constant Expression expected
 type_e_operator_not_supported_for_types=04053_E_Operation "$1" not supported for types "$2" and "$3"
 % The operation is not allowed for the supplied types.
 type_e_illegal_type_conversion=04054_E_Illegal type conversion: "$1" to "$2"
-% The operation is allowed for compatibility but types are not .
-type_w_dangerous_type_conversion=04132_W_Dangerous type conversion: "$1" to "$2"
 % When doing a type-cast, you must take care that the sizes of the variable and
 % the destination type are the same.
 type_w_dangerous_type_conversion=04132_W_Type conversion between unrelated/incompatible types: "$1" to "$2"