Make package loadable on macOS

[giordano]

I verified this fixes #489:

julia> using oneAPI
┌ Error: No oneAPI Level Zero loader found for your platform. Currently, only Linux x86 is supported.
│ If you have a local oneAPI toolchain, you can use that; refer to the documentation for more details.
└ @ oneAPI.oneL0 ~/.julia/packages/oneAPI/8uwwt/lib/level-zero/oneL0.jl:118

julia> 

The message is only an @error logging, but the session is otherwise fully functional.

CC: @vchuravy. PR best reviewed by ignoring whitespace changes.

[github-actions]

Your PR no longer requires formatting changes. Thank you for your contribution!

[codecov]

Codecov Report

Attention: Patch coverage is 83.33333% with 1 line in your changes missing coverage. Please review.

Project coverage is 81.86%. Comparing base (1c34336) to head (3724302).
Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
src/oneAPI.jl	83.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #493      +/-   ##
==========================================
+ Coverage   81.85%   81.86%   +0.01%     
==========================================
  Files          44       44              
  Lines        2529     2531       +2     
==========================================
+ Hits         2070     2072       +2     
  Misses        459      459              

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