Disable broken hardware-based linear KA index.

[maleadt]

Work around #346

[codecov]

Codecov Report

❌ Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 78.86%. Comparing base (5355310) to head (2d985e2).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/OpenCLKernels.jl	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #348      +/-   ##
==========================================
- Coverage   78.98%   78.86%   -0.12%     
==========================================
  Files          12       12              
  Lines         671      672       +1     
==========================================
  Hits          530      530              
- Misses        141      142       +1     

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