[omniORB] fixed typecode unmarshalling bug

[Renzo Tomaselli]

Hi,
    we cannot unmarshal a fixed typecode (v 4.0, Windows platform).
An exception is thrown in typecode.cc at line #4477, since tk_fixed is a
plt_Simple but it was left out from that section of code.
I guess there should be something like:

    case CORBA::tk_fixed:
      return TypeCode_string::NP_unmarshalSimpleParams(s, otbl);

Thanks,

Renzo Tomaselli