HTTPCLIENT-1560: Request mutual auth in WinHttpClient
Contributed by Michael Osipov <michaelo at apache.org>

Removed ISC_REQ_CONNECTION because it is already set
by default. Added ISC_REQ_MUTUAL_AUTH which is also
required by ISC_REQ_DELEGATE.

git-svn-id: https://svn.apache.org/repos/asf/httpcomponents/httpclient/trunk@1630125 13f79535-47bb-0310-9956-ffa450edef68
HTTPCLIENT-1562: Typo in WindowsNegotiateScheme
Contributed by Michael Osipov <michaelo at apache.org>

git-svn-id: https://svn.apache.org/repos/asf/httpcomponents/httpclient/trunk@1630126 13f79535-47bb-0310-9956-ffa450edef68