Remove INSTALL-win32.txt that is now hosted in openvpn-build

Remove INSTALL-win32.txt that is now hosted in openvpn-build

The contents of INSTALL-win32.txt mostly just describe how to use
OpenVPN-GUI,
OpenVPN Windows services and openvpn-build. These are only loosely coupled
with
OpenVPN, and may change independently of it. Thus hosting the file in
openvpn-build (which brings all of these components together) makes most
sense.

URL: https://github.com/OpenVPN/openvpn-build/pull/35
URL: https://github.com/OpenVPN/openvpn-build/pull/38
Signed-off-by: Samuli Seppänen <samuli@openvpn.net>
Acked-by: David Sommerseth <davids@openvpn.net>
Message-Id: <1477396539-1293-1-git-send-email-samuli@openvpn.net>
URL: https://www.mail-archive.com/openvpn-devel@lists.sourceforge.net/msg12771.html
Signed-off-by: David Sommerseth <davids@openvpn.net>