openvpn: fix configure options

- eurephia:
commit: Remove the --disable-eurephia configure option

- fix option name:
http proxy option is now called http-proxy (see configure.ac)

fixes:
configure: WARNING: unrecognized options: --disable-nls, --disable-eurephia, --enable-http

Signed-off-by: Dirk Neukirchen <dirkneukirchen@web.de>

SVN-Revision: 47979