not used by any code in libcurl!

Problem tracked down by Bjorn Reese.

more in the same style as other curl source code. The only actual code change
is an added check after a malloc() call.

Kevin Fisk reported.

properly if no auth is available

CURLINFO_HTTPAUTH_AVAIL and CURLINFO_PROXYAUTH_AVAIL

2. made Curl_http_auth_act() reset 'authavail' unconditionally

authentication negotiations needed for NTLM, Digest etc.

again

too little data, and one case of not zero-terminating the returned string.

I chose a slightly different patch than the one Peter provided.

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