cleanups.

"Negotiate" authentication as well.

CURLINFO_HTTPAUTH_AVAIL and CURLINFO_PROXYAUTH_AVAIL

work.

build libcurl to use ares for asynch name resolves.

unsigned and we want this to be able to hold -1 for illegal/unset values.

than the remote server's. That is, both the server and the proxy can in
fact require NTLM auth.

connectdata to work as expected

connectdata struct instead. Each being an allocated pointer.

The passwdgiven field was turned into a local variable in the only
function it was being used.

authenticates connections and not single requests. This should make it work
better when we mix requests from multiple hosts. Problem pointed out by
Cris Bailiff.

   CURLOPT_SSL_CTX_FUNCTION to set a callback that gets called with the
   OpenSSL's ssl_ctx pointer passed in and allow a callback to act on it. If
   anything but CURLE_OK is returned, that will also be returned by libcurl
   all the way back. If this function changes the CURLOPT_URL, libcurl will
   detect this and instead go use the new URL.

   CURLOPT_SSL_CTX_DATA is a pointer you set to get passed to the callback set
   with CURLOPT_SSL_CTX_FUNCTION.

a "plain" Negotiate as well.

but the infrastructure is there.

to add more method in the future.

added.

comparisons before re-using SSL connections and re-using SSL connection IDs.

disables the host name check in the FOLLOWLOCATION code. With that option
set, libcurl will send user+password to all hosts.

change options on an SSL-enabled connection between requests.

related stuff within HAVE_OPENSSL_ENGINE_H and we don't make any private
typedef or similar if the header is missing...

header is used, we must wait for a 100-code (or timeout), before we send the
data. The timeout is merely 1000 ms at this point. We may have reason to set
a longer timeout in the future.

only allocating the scratch memory buffer once it is needed and not always
in the handle.