[3/3] winhttp: Keep the session open in the request object.

[Hans Leidekker]

Cookies have session scope in winhttp and they are not saved, so we
need to keep the session open to ensure that cookies are passed along
with subsequent requests.

IWinHttpRequest::Open allows you to specify whether the request should
be handled asynchronously but in the C API this is determined up front,
when you open the session. So this patch also reworks the code to make
the session asynchronous and handle waiting at the COM level.
---
 dlls/winhttp/request.c | 194 ++++++++++++++++++++++++++++---------------------
 1 file changed, 110 insertions(+), 84 deletions(-)

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