winhttp: tests/winhttp.c: Add test for sending request (TRY 3)

[Zac Brown]

Zac Brown wrote:
> Add test for WinHttpSendRequest.
> 
> Passes on Windows XP and Windows 2003.
> 
> Changes from last patch:
> * Initialize some variables
> 
> 
> ------------------------------------------------------------------------
> 

Attached patch fixes a string that needs null termination as well as making a 
couple of the tests more thorough by checking bytes read/written.
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