updated build system to print a warning and avoid building functions requiring CUDA if the CUDA driver library, libcuda.so, cant be found
updated build system to print a warning and avoid building functions requiring CUDA if the CUDA driver library, libcuda.so, cant be found

OxfordSKA/OSKAR,OxfordSKA/OSKAR,OxfordSKA/OSKAR,OxfordSKA/OSKAR