Avoid multiple join.

Change-Id: I53656cb1096667c71f46de014eaa43127cfad53b
Reviewed-on: http://gerrit.aldebaran.lan:8080/11694
Reviewed-by: cgestes <gestes@aldebaran-robotics.com>
Tested-by: ncornu <ncornu@aldebaran-robotics.com>
qi::EventLoop: remove notifyFD

broken API, not used by clients.

Change-Id: I00d546799db70dce51631d2af29f96a1aae491f5
Reviewed-on: http://gerrit.aldebaran.lan:8080/11876
Reviewed-by: rhumbert <rhumbert@aldebaran-robotics.com>
Reviewed-by: mnottale <mnottale@aldebaran-robotics.com>
Tested-by: cgestes <gestes@aldebaran-robotics.com>