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

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-UPGRADING FROM 2.3-ALPHA1 AND EARLIER
-
-OpenVPN Windows installer went through major changes in
-2.3-alpha2. To avoid any unexpected behavior, it is strongly
-suggested to upgrade as follows.
-
-First backup configuration files and certificates from your
-current installation; by default they're in
-
-    C:\Program Files\OpenVPN\config (32-bit Windows)
-    C:\Program Files (x86)\OpenVPN\config (64-bit Windows)
-
-After this, stop the openvpn-gui or the openvpn service
-wrapper, if either of them is running and uninstall OpenVPN.
-Finally, remove the OpenVPN install directory entirely (e.g.
-using Windows Explorer as administrator).
-
-Finally, install the new version of OpenVPN and copy over
-your configuration files and certificates, which now go to
-
-    C:\Program Files\OpenVPN\config
-
-provided you did not install the 32-bit version on 64-bit
-Windows.
-
-IMPORTANT NOTE FOR WINDOWS VISTA/7 USERS
-
-Note that on Windows Vista, you will need to run the OpenVPN
-GUI with administrator privileges, so that it can add routes
-to the routing table that are pulled from the OpenVPN server.
-You can do this by right-clicking on the OpenVPN GUI
-desktop icon, and selecting "Run as administrator".
-
-GENERAL QUICKSTART FOR WINDOWS
-
-The OpenVPN Client requires a configuration file
-and key/certificate files. You should obtain
-these and save them to OpenVPN's configuration
-directory, usually C:\Program Files\OpenVPN\config.
-
-You can run OpenVPN as a Windows system service or by using
-the client GUI. To use the OpenVPN GUI, double click on the
-desktop icon or start menu icon. The OpenVPN GUI is a
-system-tray applet, so an icon for the GUI will appear in
-the lower-right corner of the screen. Right click on the
-system tray icon, and a menu should appear showing the names
-of your OpenVPN configuration files, and giving you the
-option to connect.
-
-BUILDING OPENVPN FOR WINDOWS
-
-Official OpenVPN Windows releases are cross-compiled on Linux using the
-openvpn-build buildsystem:
-
-    https://community.openvpn.net/openvpn/wiki/BuildingUsingGenericBuildsystem
-
-First setup the build environment as shown in the above article. Then fetch the
-openvpn-build repository:
-
-    git clone https://github.com/OpenVPN/openvpn-build.git
-
-Review the build configuration:
-
-    openvpn-build/generic/build.vars
-    openvpn-build/windows-nsis/build-complete.vars
-
-Build (unsigned):
-
-    cd openvpn-build/windows-nsis
-    ./build-complete
-
-Build (signed):
-
-    cd openvpn-build/windows-nsis
-    ./build-complete --sign --sign-pkcs12=<pkcs12-file>\
-    --sign-pkcs12-pass=<pkcs12-file-password> \
-    --sign-timestamp="<timestamp-url>"