[gnutls-devel] GnuTLS | WIP: AIA callback to retrieve missing chain certificates (!1262)

[Development of GNU's TLS library]

Daiki Ueno started a new discussion on lib/includes/gnutls/abstract.h: https://gitlab.com/gnutls/gnutls/-/merge_requests/1262#note_351493519

>      (gnutls_certificate_credentials_t cred,
>       gnutls_certificate_retrieve_function3 *func);
>  
> +typedef int gnutls_trust_list_getissuer_function(gnutls_x509_crt_t crt,
> +                                                 gnutls_x509_crt_t issuer);

I would suggest changing the signature to:
```c
typedef int gnutls_trust_list_getissuer_function(const gnutls_x509_trust_list_t tlist,
                                                 const gnutls_x509_crt_t issuer,
                                                 gnutls_x509_crt_t crt);
```
The first argument makes it future proof, if we eventually add `gnutls_x509_trust_list_{set,get}_ptr` functions for applications. The `const` serves the documentation that the callback is supposed to set `crt` using the information of `issuer`.

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