lib: fix build error and compiler warnings with verbose strings disabled #18799
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FreeBSD cmake, and clang-tidy:
```
/home/runner/work/curl/curl/lib/multi.c:1107:28: error: code will never be executed [-Werror,-Wunreachable-code]
1107 | size_t timeout_count = Curl_llist_count(&data->state.timeoutlist);
| ^~~~~~~~~~~~~~~~
/home/runner/work/curl/curl/lib/multi.c:3054:35: error: code will never be executed [-Werror,-Wunreachable-code]
3054 | struct Curl_llist_node *e = Curl_llist_head(&data->state.timeoutlist);
| ^~~~~~~~~~~~~~~
/home/runner/work/curl/curl/lib/multi.c:3380:7: error: code will never be executed [-Werror,-Wunreachable-code]
3380 | Curl_llist_head(&data->state.timeoutlist);
| ^~~~~~~~~~~~~~~
3 errors generated.
```
Ref: https://github.com/curl/curl/actions/runs/18177771802/job/51747389974?pr=18797#step:3:2010
Ref: https://github.com/curl/curl/actions/runs/18177900713/job/51747803940?pr=18797#step:8:464
/Users/runner/work/curl/curl/lib/asyn-ares.c:751:17: error: code will never be executed [clang-diagnostic-unreachable-code,-warnings-as-errors]
751 | char *csv = ares_get_servers_csv(ares->channel);
| ^~~~~~~~~~~~~~~~~~~~
1 warning generated.
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asyn-ares: fix compiler warning:
curl_trc: fix missing symbol:
Ref: https://app.circleci.com/pipelines/github/curl/curl/15446/workflows/67afa113-9c49-4249-9180-f6f01fc7dfdd/jobs/149177
Ref: https://github.com/curl/curl/actions/runs/18174250400/job/51736249444#step:33:623
Follow-up to b022389 ip-happy: do not set unnecessary timeout #18768
multi: fix
-Wunreachable-code:Cherry-picked from #18797