FindCUDA: do not use CUDA_nppicom_LIBRARY in CUDA 11.0+
Currently, with CUDA 11.0+ FindCUDA script returns such an error:
CMake Error: The following variables are used in this project, but they are set to NOTFOUND. Please set them or make sure they are set and tested correctly in the CMake files: CUDA_nppicom_LIBRARY (ADVANCED)
This patch fixes the error.