use fetchcontent to get opencl kernel

[StRigaud]

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[codecov-commenter]

Codecov Report

Base: 77.88% // Head: 77.88% // No change to project coverage 👍

Coverage data is based on head (31a77aa) compared to base (51a3300).
Patch has no changes to coverable lines.

❗ Current head 31a77aa differs from pull request most recent head 2c0e6b5. Consider uploading reports for the commit 2c0e6b5 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #122   +/-   ##
=======================================
  Coverage   77.88%   77.88%           
=======================================
  Files         164      164           
  Lines        8043     8043           
=======================================
  Hits         6264     6264           
  Misses       1779     1779           

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