Improve Windows version detection with manifest

Improve Windows version detection with manifest

Add manifest file to detect Windows versions greater than Windows 8.

Below is example output on Windows 10.

Before:
        Windows version 6.2 (Windows 8 or greater) 64bit

After:
        Windows version 10.0 (Windows 10 or greater) 64bit

Signed-off-by: Lev Stipakov <lev@openvpn.net>
Acked-by: Gert Doering <gert@greenie.muc.de>
Message-Id: <20200724195634.493-1-lstipakov@gmail.com>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg20580.html
Signed-off-by: Gert Doering <gert@greenie.muc.de>