Bugfix/cuda10420

This is supposed to fix https://svn.boost.org/trac/boost/ticket/10420 and allow the compilation of .cu files that includes boost headers even if using the intel compiler (nvcc -ccbin=icpc foo.cu).
It just avoir de redefinition of BOOST_COMPILER that same way as it is handle with g++ and visualC++ (ie: keep th ecuda compiler name)