authentication negotiations needed for NTLM, Digest etc.

Also reported to work with OpenLDAP 2.0.26.

Jeff Pohlmeyer fixed.

for us to deal with

only file within libcurl to use that function

file instead

function

NULL!

Curl_is_resolved() function

we need to check for its presence in the configure script

when we cleanup the SSL stuff to not leak any memory.

I wish this was documented anywhere.

pointers to the internal default functions

out if necessary

2. don't leave allocated memory behind when returning error

allocation calls will succeed, the following will return NULL!

NTLM patch. Test case 84 and 85 verify this.