lib: refactor the type of funcs which have useless return and checks

lib: refactor the type of funcs which have useless return and checks

Some internal functions always return CURLE_OK.

- Curl_http_proxy_get_destination() does that from bb4032a, (2 years
  ago) And the original inline code does not need to check the status.

- Curl_wildcard_init() does that from e60fe20. (8 years ago)

- Curl_initinfo() does that from a very beginning.

- Curl_pgrsSetDownloadCounter() did not have a return before 914e49b,
  ad051e1 recovered its content (2 years ago) but did not completely
  recovered the changes related to it.

- auth_digest_get_qop_values() does that from 676de7f.

This directly changes their type to void and cleaned the remaining
checks for their return value.

Closes #19386