Define some missing len intrinsics
Define some missing len intrinsics

pombredanne/pythran,hainm/pythran,pbrunet/pythran,pombredanne/pythran,pombredanne/pythran,hainm/pythran,artas360/pythran,serge-sans-paille/pythran,hainm/pythran,pbrunet/pythran,artas360/pythran,serge-sans-paille/pythran,pbrunet/pythran,artas360/pythran