more virtual packages for providing libcuda.so.1 and libOpenCL.so.1

[Graham Inggs]

Hi Alberto

Thanks for making the changes to the Nvidia drivers.  My syncs and merges
for LP: #1129409 have been uploaded as well.

The issue in LP: #1174205 wasn't the search order of
/etc/ld.so.conf.d/*.conf, we shouldn't have allowed ocl-icd-libopencl1 and
Nvidia's libopencl1 to be installed together.

This has been fixed to a certain extent in the current Nvidia drivers in
Saucy as the Nvidia drivers now provides and conflicts on libopencl1.
However, since the Nvidia driver includes libopencl1 and opencl-icd in one
package, ocl-icd-libopencl, which pyopencl is built against, is not
installable.
Also, since pyopencl is built against ocl-icd-libopencl which is OpenCL
1.2, it cannot run on Nvidia's libopencl1 which is OpenCL 1.1.

One solution is to separate libopencl1 out of the Nvidia and AMD drivers,
however, since the open-source ocl-icd-libopencl1 is able to load all of
the available ICDs, could we simply remove libOpenCL.so from the Nvidia and
AMD drivers and no longer provide libopencl1?
We must keep the Nvidia and AMD ICDs and continue to provide opencl-icd
though.

Regards
Graham
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