Add file required only for Swift 5.3.x or before on Linux

[sushichop]

No description provided.

[codecov]

Codecov Report

Merging #25 (2bff827) into main (d670c66) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #25   +/-   ##
=======================================
  Coverage   97.74%   97.74%           
=======================================
  Files          10       10           
  Lines         399      399           
=======================================
  Hits          390      390           
  Misses          9        9           

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