curl_easy_setopt.3: added the proto for CURLOPT_SSH_KNOWNHOSTS

for libcurl how to proceed. The callback will only be called if

\fICURLOPT_SSH_KNOWNHOSTS\fP is also set.

.nf

int curl_sshkeycallback (CURL *easy,     /* easy handle */

                         const struct curl_khkey *knownkey, /* known */

                         const struct curl_khkey *foundkey, /* found */

                         enum curl_khmatch, /* libcurl's view on the keys */

                         void *clientp);

.fi

The curl_sshkeycallback function gets passed the CURL handle, the key from the

known_hosts file, the key from the remote site, info from libcurl on the

matching status and a custom pointer (set with \fICURLOPT_SSH_KEYDATA\fP). It