wininet: Always send a content length header, even if there is no content.

[Hans Leidekker]

Two different apps and the included test show that when the message
body of an http request is emtpy, Windows adds a zero value content
length header, whereas Wine omits the header.

Some webserver products (but not Apache) always require the header
and return a 411 status when they find it missing.

See bug http://bugs.winehq.org/show_bug.cgi?id=5444

 -Hans

Changelog
 Always send a content length header, even if there is no content.
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