[cmake] specify compilers in installed CMakeLists.txt
[cmake] specify compilers in installed CMakeLists.txt

otherwise detected flags don't match if selected compiler differs from
default compiler (e.g. compiled siconos with clang on ubuntu)

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