[numerics] fix build on Apple
[numerics] fix build on Apple

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