DoH: Change to use runtime with current thread scheduler in doh_query() am:...

use std::str::FromStr;

use std::sync::{Arc, Mutex};

use std::{ptr, slice};

use tokio::runtime::Runtime;

use tokio::runtime::Builder;

use tokio::sync::oneshot;

use tokio::task;

use url::Url;

        return DOH_RESULT_CAN_NOT_SEND;

    }

    if let Ok(rt) = Runtime::new() {

    if let Ok(rt) = Builder::new_current_thread().enable_all().build() {

        let local = task::LocalSet::new();

        match local.block_on(&rt, async { timeout(t, resp_rx).await }) {

            Ok(v) => match v {