Consider renaming nvidia-opencl-icd to nvidia-icd (or similar) and make
nvidia-opencl-icd a dummy package that at most Suggests: nvidia-icd.
cf. #769072

Goals for jessie:
=================

  * automatic configuration of Xorg
    - fix Xorg autodetection (which may be an insufficiency in the nvidia
      driver that does not expose its supported PCI IDs properly), see
      #586502
