Explicitly configure libdir to lib

[Szpadel]

Without this setting static library
is placed in lib or lib64 depending on platform

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.18%. Comparing base (4a36ba0) to head (982a540).

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #39   +/-   ##
=======================================
  Coverage   99.18%   99.18%           
=======================================
  Files          12       12           
  Lines         854      854           
=======================================
  Hits          847      847           
  Misses          7        7           

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[inflation]

I guess I shouldn't hardcode the library path, since the user could modify it by env as well. Perhaps reading from the generated pkg-config?

[Szpadel]

Also sounds like solution.
I'm not familiar with enough with pkg-config and cmake configurations, therefore I failed to influence that from env.
For me any way that would make this reliable is good.
I found that linux defaults to lib64 and macos to lib therefore if you want to test that locally (I'm assuming you use macos from hardcoded path) docker should be easiest way

[inflation]

Integrated in #46. Thanks.