The default cache timeout for this is 60 seconds, which is arbitrary and
completely subject to change :)

    - Use a global dns cache (via setting the tentatively named,
    CURLOPT_DNS_USE_GLOBAL_CACHE option to true)
    - Use a per-handle dns cache, by default
    - Use a pooled dns cache when in the "multi" interface

Renamed: the TimeCond type to curl_TimeCond

curl_global_cleanup().  Update corresponding man pages...

Improve the logic in curl_global_cleanup() and curl_global_init() so that
they are not called twice if the application libraries have been
initialized and make sure to reset the init flags in curl_global_cleanup().

it will make it better when the application uses several libs that use
openssl and it also enables us to do the win32 winsock initing in the future
if we want to

symbol, but libcurl will not return this ever

CURLE_SSL_PEER_CERTIFICATE is added