Allow non-cgo builds for Darwin

[cmaglie]

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• Tests for the changes have been added (for bug fixes / features)
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What kind of change does this PR introduce?

Allow build without CGO enabled for darwin.

What is the current behavior?

What is the new behavior?

Language detection using MacOS APIs is disabled for non-CGO builds on darwin.

Does this PR introduce a breaking change, and is titled accordingly?

Other information

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: -0.07 ⚠️

Comparison is base (422a42c) 62.98% compared to head (6eb0ecf) 62.92%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2213      +/-   ##
==========================================
- Coverage   62.98%   62.92%   -0.07%     
==========================================
  Files         218      218              
  Lines       19466    19466              
==========================================
- Hits        12261    12249      -12     
- Misses       6122     6131       +9     
- Partials     1083     1086       +3     

Flag	Coverage Δ
unit	62.92% <ø> (-0.07%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
i18n/detect_cgo_darwin.go	80.00% <ø> (ø)

... and 1 file with indirect coverage changes

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