fix: add another heuristic for libc discovery

[mayeut]

towards #512

This also adds tests to cross-repair simple wheels with no dependencies (across both libc & architecture axes).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.76%. Comparing base (fb071da) to head (d978dc1).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #564      +/-   ##
==========================================
+ Coverage   92.68%   92.76%   +0.07%     
==========================================
  Files          21       21              
  Lines        1737     1755      +18     
  Branches      326      331       +5     
==========================================
+ Hits         1610     1628      +18     
  Misses         77       77              
  Partials       50       50              

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