After copying a lib to the wheel directory, set its writeable bit if necessary

[jvolkman]

Some build systems (e.g., Bazel) generate read-only artifacts, and shutil.copy also copies these modes.

Auditwheel has the same logic here.

[HexDecimal]

There's a pathlib version of this code that I'd prefer over copying from Auditwheel, but that can always be resolved later.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (eaba43d) 96.45% compared to head (e624fe9) 96.46%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #202      +/-   ##
==========================================
+ Coverage   96.45%   96.46%   +0.01%     
==========================================
  Files          15       15              
  Lines        1184     1188       +4     
==========================================
+ Hits         1142     1146       +4     
  Misses         42       42              

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