wininet: Don't overwrite content length header in HttpSendRequest.

[Hans Leidekker]

Google Sketchup runs into another wininet bug after my previous fix.
It explicitly adds a non-zero content length header to the request but
passes content length 0 when the request is sent. As the included test
shows, Windows does not overwrite any existing content length header.

See http://bugs.winehq.org/show_bug.cgi?id=11954

 -Hans

Changelog
 Don't overwrite content length header in HttpSendRequest.
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