Require Threads package and add missing Clang 14 package

[offa]

Fixes the Could NOT find Threads (missing: Threads_FOUND) error on Clang 14.

[codecov[bot]]

Codecov Report

Merging #189 (d8b596b) into master (cc6c1a5) will increase coverage by 0.19%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #189      +/-   ##
==========================================
+ Coverage   34.65%   34.84%   +0.19%     
==========================================
  Files          53       54       +1     
  Lines        2323     2330       +7     
  Branches      354      355       +1     
==========================================
+ Hits          805      812       +7     
  Misses       1429     1429              
  Partials       89       89              

see 1 file with indirect coverage changes

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