OpenCL CPU test is no longer working in Travis-CI

[keryell]

The Intel OpenCL CPU stack used to be used by Travis-CI but it looks like it is no longer available on-line in the way it was down=loaded automatically with https://github.com/KhronosGroup/SyclParallelSTL/blob/master/.travis/install_intel_opencl.sh from
http://registrationcenter-download.intel.com/akdlm/irc_nas/12513/opencl_runtime_16.1.2_x64_rh_6.4.0.37.tgz

[keryell]

@bashbaug is there an official way to use Intel CPU OpenCL implementation in some public continuous integration framework?

[bader]

@keryell, please, update the link to the Intel OpenCL CPU run-time: http://registrationcenter-download.intel.com/akdlm/irc_nas/12556/opencl_runtime_16.1.2_x64_rh_6.4.0.37.tgz

Correct link can be found at https://software.intel.com/en-us/articles/opencl-drivers#latest_CPU_runtime.

[keryell]

Thank you @bader and @bashbaug for making the Khronos world brighter. :-)
I fixed this in #72