Option to sanitize rpaths

[isuruf]

Fixes #101

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (082ab1e) 95.11% compared to head (ccc82a1) 95.21%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #164      +/-   ##
==========================================
+ Coverage   95.11%   95.21%   +0.10%     
==========================================
  Files          15       15              
  Lines        1167     1192      +25     
==========================================
+ Hits         1110     1135      +25     
  Misses         57       57              

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[PhilipGarnero]

Can we merge this ? Work seems good to me. Even if deemed not perfect, it's more useful than nothing.
A click on the merge button please ! 🙇‍♂️

[HexDecimal]

The fakepkg_rpath wheel adds lib/ to its rpaths to more easily link its libraries with delocate, but it's not what you'd want in a post-delocated wheel so I've added a test which sanitizes it away.

I've edited this PR so that only @executable_path/ and @loader_path/ are allowed when sanitizing. Which I think is what's expected but it's hard to tell.