[numerics] fix compilation when PATH is not enabled
[numerics] fix compilation when PATH is not enabled

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