message: cmake: fix CUDA flags generation
  VTK uses parentheses in defines, so generated code is wrong:
  set(nvcc_flags -m64;-D__OPENCV_BUILD=1;-DvtkRenderingContext2D_AUTOINIT=1(vtkRenderingContextOpenGL);...)
diff: @@ -72,7 +72,7 @@ set(generated_cubin_file_internal "@generated_cubin_file@") # path
  set(CUDA_NVCC_EXECUTABLE "@CUDA_NVCC_EXECUTABLE@") # path
  set(CUDA_NVCC_FLAGS @CUDA_NVCC_FLAGS@ ;; @CUDA_WRAP_OPTION_NVCC_FLAGS@) # list
  @CUDA_NVCC_FLAGS_CONFIG@
  -set(nvcc_flags @nvcc_flags@) # list
  +set(nvcc_flags "@nvcc_flags@") # list
  set(CUDA_NVCC_INCLUDE_ARGS "@CUDA_NVCC_INCLUDE_ARGS@") # list (needs to be in quotes to handle spaces properly).
  set(format_flag "@format_flag@") # string
  