FindCUDAToolkit: if some cuda shared libraries aren't found, it must look for then in lib/stubs

When you want to compile CUDA code but doesn't have the driver installed, CUDA toolkit provides some stub libraries in lib/stubs. These should be checked as last resort.

So inside function find_and_add_cuda_import_lib, one should add "stubs" as last PATH_SUFFIXES to the call find_library(CUDA_${lib_name}_LIBRARY

With this change I was able to build the project here.