wget2 | Bug: OpenSSL does not safely share some user data among threads (#614)

[Ander Juaristi (@juaristi)]

Ander Juaristi created an issue: https://gitlab.com/gnuwget/wget2/-/issues/614

Assignee: Ander Juaristi

The `vflags` structure is being shared among threads in a completely unsafe 
manner.

This is because it is being set as "user data" globally such that all threads 
share the same pointer (`_ctx` is a global variable).

```
store = SSL_CTX_get_cert_store(_ctx);
if (!store) {
}


if (!X509_STORE_set_ex_data(store, store_userdata_idx, (void *) vflags)) {
        retval = WGET_E_UNKNOWN;
        goto bail;
}

```

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