Upgrade Openconnect to version 1.1 supporting gp protocol

Please follow following steps on ubuntu command line :

1. Open a terminal (Ctrl+Alt+t).
2. Clone latest code : git clone git://git.infradead.org/users/dwmw2/openconnect.git and cd to directory
3. Use the command : ./autogen.sh
4. Issue the command ./configure.
5. Issue the command make (You may need to run sudo apt install make gcc before running this command successfully).
6. Run make test to check for possible errors.
7. Backup current openconnect binary:  whereis openconnect (and remove all files) sudo mv /usr/sbin/openconnect ~/tmp sudo mv /usr/local/sbin/openconnect ~/tmp
8. Issue the command sudo make install.
9. Create symbolic link from newly install binary to the default location: sudo ln -s /usr/local/sbin/openconnect /usr/sbin/openconnect