[cmake] Add swig flag -py3 for Python 3+, fix missing "-D__${SYSTEM_ARCHITECTURE}__"
[cmake] Add swig flag -py3 for Python 3+, fix missing "-D__${SYSTEM_ARCHITECTURE}__"

radarsat1/siconos,radarsat1/siconos,fperignon/siconos,radarsat1/siconos,siconos/siconos,fperignon/siconos,radarsat1/siconos,bremond/siconos,bremond/siconos,bremond/siconos,siconos/siconos,bremond/siconos,bremond/siconos,fperignon/siconos,siconos/siconos,radarsat1/siconos,fperignon/siconos,fperignon/siconos,siconos/siconos