CI is broken due to intel-igc-opencl dependency

[vmx]

Currently PRs cannot be built on Travis CI due to:

$ sudo -E apt-get -yq --no-install-suggests --no-install-recommends $(travis_apt_get_options) install intel-opencl ocl-icd-opencl-dev
Reading package lists...
Building dependency tree...
Reading state information...
Some packages could not be installed. This may mean that you have
requested an impossible situation or if you are using the unstable
distribution that some required packages have not yet been created
or been moved out of Incoming.
The following information may help to resolve the situation:
The following packages have unmet dependencies:
 intel-opencl : Depends: intel-igc-opencl but it is not installable
E: Unable to correct problems, you have held broken packages.

Using ppa:ocl-dev/intel-opencl instead of ppa:intel-opencl/intel-opencl would fix that problem, but I'm unsure if that would be the right thing to do.

[boydjohnson]

intel/compute-runtime#233 says there was a package rename and mentions intel-opencl-icd.