Windows installer changes:
* ifdefed out the check Windows version code which is causing
problems on Windows 7
* don't define SF_SELECTED if it is already defined
git-svn-id: http://svn.openvpn.net/projects/openvpn/branches/BETA21/openvpn@3855 e7ae566f-a301-0410-adde-c780ea21d3b5