Use armv7l policy for 64-bit arm kernel in 32-bit mode (armv8l)

[mayeut]

Towards pypa/manylinux#1455

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.01 🎉

Comparison is base (0dd24f0) 92.31% compared to head (79ae584) 92.33%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #419      +/-   ##
==========================================
+ Coverage   92.31%   92.33%   +0.01%     
==========================================
  Files          23       23              
  Lines        1289     1291       +2     
  Branches      301      302       +1     
==========================================
+ Hits         1190     1192       +2     
  Misses         57       57              
  Partials       42       42              

Impacted Files	Coverage Δ
src/auditwheel/policy/__init__.py	98.24% <100.00%> (+0.03%)	⬆️

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[mayeut]

@lkollar, I'm willing to take a chance on this one in order to get things started for armv7l builds on aarch64 systems with 32-bit userland. There are still things that require some checks but I think it will be easier to get feedback if we do release this (it could come with a big disclaimer that this is an alpha feature).