[#3388] Update licence in client's .c files

sflphone-client-gnome/VERSION

sflphone-client-gnome/configure.ac

sflphone-client-gnome/src/accountlist.c

sflphone-client-gnome/src/actions.c

sflphone-client-gnome/src/callable_obj.c

sflphone-client-gnome/src/codeclist.c

sflphone-client-gnome/src/conference_obj.c

sflphone-client-gnome/src/config/accountconfigdialog.c

sflphone-client-gnome/src/config/accountlistconfigdialog.c

sflphone-client-gnome/src/config/addressbook-config.c

sflphone-client-gnome/src/config/assistant.c

sflphone-client-gnome/src/config/audioconf.c

sflphone-client-gnome/src/config/hooks-config.c

sflphone-client-gnome/src/config/preferencesdialog.c

sflphone-client-gnome/src/config/shortcuts-config.c

sflphone-client-gnome/src/config/tlsadvanceddialog.c

sflphone-client-gnome/src/config/utils.c

sflphone-client-gnome/src/config/zrtpadvanceddialog.c

sflphone-client-gnome/src/contacts/addressbook.c

sflphone-client-gnome/src/contacts/addressbook/eds.c