[numerics] fix compilation of numerics in C++
[numerics] fix compilation of numerics in C++

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