cmake: expose CUDA::cuda_driver dependency in use

Without this, CUDA::cuda_driver target is not linked to libocca during
consumption and as a result there is a build problem: libcuda.so cannot
be found. This occurs on machines which do not have CUDA lib default,
 compiler included libraries (e.g. in /lib64)

CMakeLists.txt

@@ -145,7 +145,7 @@ if(OCCA_ENABLE_CUDA)
     message("-- CUDA driver library: ${CUDAToolkit_LIBRARY_DIR}")
 
     # Use the provided imported target CUDA::cuda_driver, to make our package relocatable
-    target_link_libraries(libocca PRIVATE CUDA::cuda_driver)
+	target_link_libraries(libocca PUBLIC CUDA::cuda_driver)
   else()
     set(OCCA_CUDA_ENABLED 0)
   endif()