client: Add example code for ssh_get_openssh_version().
client: Add example code for ssh_get_openssh_version().

BUG: https://red.libssh.org/issues/120

kedazo/libssh,bigcat26/libssh-mod,sebadoom/libssh,wangshawn/libssh,kedazo/libssh,robxu9/libssh,kedazo/libssh,nviennot/libssh,mwgoldsmith/libssh,robxu9/libssh,DouglasHeriot/libssh,pouete/libssh,Distrotech/libssh,bigcat26/libssh-mod,pouete/libssh,pouete/libssh,mwgoldsmith/ssh,taikoo/libssh,mwgoldsmith/libssh,robxu9/libssh,mwgoldsmith/libssh,DouglasHeriot/libssh,sebadoom/libssh,DouglasHeriot/libssh,elastichosts/libssh,taikoo/libssh,pouete/libssh,mwgoldsmith/libssh,mwgoldsmith/ssh,mwgoldsmith/ssh,kedazo/libssh,Distrotech/libssh,DouglasHeriot/libssh,Distrotech/libssh,sebadoom/libssh,robxu9/libssh,elastichosts/libssh,nviennot/libssh,bigcat26/libssh-mod,bigcat26/libssh-mod,wangshawn/libssh,sebadoom/libssh,taikoo/libssh,wangshawn/libssh,Distrotech/libssh,nviennot/libssh,mwgoldsmith/ssh,nviennot/libssh,elastichosts/libssh,taikoo/libssh,wangshawn/libssh