feature: allow specifying additional library paths (fixes: #373)

[jlaine]

Add new --add-path option to auditwheel repair to search for libraries in additional directories. This avoid having to manipulate LD_LIBRARY_PATH in the calling process (e.g. cibuildwheel), as this can have undesirable side-effects.

The name of the option is chosen to match the one provided by delvewheel on Windows.

fixes #373

[jlaine]

NOTE: this option would actually also make sense for the lddtree and show commands but I was unsure how to add it to multiple commands without duplicating code.

[codecov[bot]]

Codecov Report

Merging #374 (ae0aae5) into main (bc524d6) will decrease coverage by 0.35%. The diff coverage is 28.57%.

@@            Coverage Diff             @@
##             main     #374      +/-   ##
==========================================
- Coverage   92.36%   92.01%   -0.36%     
==========================================
  Files          23       23              
  Lines        1258     1265       +7     
  Branches      307      309       +2     
==========================================
+ Hits         1162     1164       +2     
- Misses         55       59       +4     
- Partials       41       42       +1     

Impacted Files	Coverage Δ
src/auditwheel/main_repair.py	84.28% <28.57%> (-6.20%)	:arrow_down:

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[jlaine]

@mayeut note that all of the tests in tests/integration/test_manylinux.py which currently manipulate LD_LIBRARY_PATH could be rewritten to use this new option. Would you like me to do this?

[zoj613]

What the progress on this? I have ran into this issue repairing wheels that were built linking to libraries installed bia conda.

[mwtoews]

Would this PR resolve limitation #1? For instance, I'd like to create a package using pure ctypes.