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Incorrectly getting "Enabling single compilation unit for the CUDA non-bonded module." when using Cuda 9.0 and gromacs 2018.1 - Redmine #2561

The Cmake code in cmake/gmxManageGPU.cmake incorrectly ends up in the
message(STATUS “Enabling single compilation unit for the CUDA non-bonded module….”
part of the if-stmt when building with CUDA 9.9
It does this despite correctly identifying CUDA 9.0 and using only >= 3.0 cuda targets.

Since the code in cmake/gmxManageNvccConfig.cmake correctly sets GMX_CUDA_NVCC_FLAGS regardless of doing autodetection or using user specified SM/COMPUTE targets, the code in cmake/gmxManageGPU.cmake macro(gmx_gpu_setup) can be simplified to:

if (GMX_GPU AND NOT GMX_CLANG_CUDA)
  gmx_check_if_changed(_gmx_cuda_target_changed GMX_CUDA_NVCC_FLAGS)
  if(_gmx_cuda_target_changed OR NOT GMX_GPU_DETECTION_DONE)
    if(GMX_CUDA_NVCC_FLAGS MATCHES "_2[01]")
      message(STATUS "Enabling single compilation unit...
    else()
      message(STATUS "Enabling multiple compilation
...

(This is the problem I incorrectly targeted in issue 2560)

(from redmine: issue id 2561, created on 2018-06-26 by akesandgren, closed on 2018-08-21)

Disable single compilation unit with CUDA 9.0

CUDA 9.0 does not support CC 2.x, hence even with the default list of
targeted arch, multiple compilation units an be enabled.

Fixes #2561

Change-Id: I741081da39539f211fad32bda5c1f1dccc4378f9