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Cuda fixes

Merged Hans-Nikolai Viessmann requested to merge hans/sac2c:cuda-fixes into develop

This merge request is made up of three parts:

  1. we fix some runtime problems within CUDA and HWLOC (relating to the recent runtime/libsac reshuffle)
  2. update sac2c CUDA backend to support -arch=sm_35 for CUDA (as sm_20 and lower are no longer supported by CUDA 9 (depreciated in CUDA 8). This update though is a rough fix and we should probably re-evaluate how we encode CUDA backend parameters in regards the the hardware constraints set out by CUDA CC.
  3. extend the CMAKE configuration phase to better detect CUDA - we now actually compile some code the gives out detailed information about the state of CUDA on the system.