Start work on 304.123-0ubuntu1
Refresh files from templates
debian/substvars: add support for X ABI 18
debian/templates/dkms.conf.in: drop kernel patches
Remove breaks/replaces on opencl-icd, and depend on ocl-icd-libopencl1 | nvidia-libopencl1-*.

Thanks to Graham Inggs for the patch.

Fixes LP: #1247736
Refresh files from templates
Release 304.123-0ubuntu1