Add IVAS_ERR_INTERNAL_FATAL case into IVAS_ENC_GetErrorMessage().

        case IVAS_ERR_INDEX_OUT_OF_BOUNDS:

            return "index out of bounds";

        case IVAS_ERR_INTERNAL:

        case IVAS_ERR_INTERNAL_FATAL:

            return "internal error";

        case IVAS_ERR_RECONFIGURE_NOT_SUPPORTED:

            return "reconfigure not supported";