Add runtime dependency on patchelf

[lkollar]

Use the PyPI version so users don't have to install this with the system package manager.

Closes: #386

[codecov[bot]]

Codecov Report

Merging #387 (ecb42db) into main (ea89fcb) will not change coverage. The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #387   +/-   ##
=======================================
  Coverage   92.42%   92.42%           
=======================================
  Files          23       23           
  Lines        1267     1267           
  Branches      311      311           
=======================================
  Hits         1171     1171           
  Misses         55       55           
  Partials       41       41           

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[mayeut]

closing per comments in #386