message: Remove CUDA 9.0 exception for constexpr parameter
  `--expt-relaxed-constexpr` is now used for every CUDA version
diff: @@ -121,11 +121,9 @@ target_sources(ginkgo_cuda
  stop/criterion_kernels.cu
  stop/residual_norm_kernels.cu)
  -# This creates a compilation bug on nvcc 9.0.102 *with* the new array_deleter
  -# merged at commit ed12b3df5d26, and the parameter is not recognized by clang-cuda
  -if(CMAKE_CUDA_COMPILER_ID STREQUAL "NVIDIA" AND
  - NOT CMAKE_CUDA_COMPILER_VERSION MATCHES "9.0")
  +if(CMAKE_CUDA_COMPILER_ID STREQUAL "NVIDIA")
  # remove false positive CUDA warnings when calling one<T>() and zero<T>()
  + # and allows the usage of std::array for nvidia GPUs
  target_compile_options(ginkgo_cuda
  PRIVATE
  $<$<COMPILE_LANGUAGE:CUDA>:--expt-relaxed-constexpr>)
  