Bug#695883: nvidia improper OpenCL dependencies

[Bob Bib]

control: reopen -1
control: reassign -1 src:nvidia-graphics-drivers 304.48-1
control: retitle -1 nvidia-libopencl1, nvidia-opencl-icd: improper OpenCL dependencies

Well, I've found one more minor dependencies defect:
'nvidia-opencl-icd' depends just on 'libopencl1' virtual package
(provided by 'amd-libopencl1', 'nvidia-libopencl1' and 'ocl-icd-libopencl1').

Thus, I suggest replacing:

Depends: libopencl1

with

Depends: nvidia-libopencl1 | libopencl1