user32: Add GetListBoxInfo

[Nikolay Sivov]

On 1/9/2012 01:28, Louis Lenders wrote:
> This should fix http://bugs.winehq.org/show_bug.cgi?id=27385
>
> (See also Remarks on http://msdn.microsoft.com/en-us/library/windows/desktop/bb775208%28v=vs.85%29.aspx : This message is equivalent to GetListBoxInfo.

> +DWORD WINAPI GetListBoxInfo(HWND hwnd)
> +{
> +    TRACE("(%p)\n", hwnd);
> +    return SendMessageW( hwnd, LB_GETLISTBOXINFO, 0, 0);
> +}
> +
Please add a test showing that it really sends a message.