'make installer' will now spit out an openvpn-gui-installer.exe. The
location of the required makensis tool can be specified by appending
MAKENSIS=/path/to/makensis to the configure command line. Otherwise
it's searched for in your $PATH. The installer target is only available
when makensis is available.
Proxy settings are fetched from the users Internet Options
for the active connection. If WPAD or a PAC script is configured
they are preferred and used for automatic proxy detection.
Proxy bypass configuration is completely ignored.