GIT, libcurl and GSS-Negotiate

Hello,

I'm having problems while trying to authenticate against a TFS hosted repository.

I experience the same problem in git for windows and in git for linux (both versions are 1.9.2).

The problem is described on a [github msysgit/git issue](https://github.com/msysgit/git/issues/171)

To shortly resume it, the problem is that:
* when the authentication method (WWW-Authenticate) is Negotiate AND
* when the server proposes a NTLMSSP_CHALLENGE in response of the
client's NTLMSSP_NEGOTIATE,
=> libcurl yields an "Authentication problem. Ignoring this.\n"
And the communication is closed.

At this point, in a normal communication, the client should send a NTLMSSP_AUTH containing a Kerberos ticket.

Having seen the libcurl source code, I think we're passing through the lines from 776 to 780 of [http.c](https://github.com/bagder/curl/blob/2e57c7e0fcfb9214b2a9dfa8b3da258ded013b8a/lib/http.c). Some guy, on the github issue page, has suggested that this could be related to an update of libcurl, when git was at its 1.8.2 version.

I'm not debugging libcurl, and I can't reproduce this problem @home. So, has somebody already experienced the same problem? Is there a solution?

Many thanks in advance, Ivo