improve finding the library on windows

[lopezca]

instead of just returning the library name, use FFIWindowsLibraryFinder.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 80.39%. Comparing base (6cb4562) to head (40d1372).
Report is 4 commits behind head on master.

Files with missing lines	Patch %	Lines
src/SQLite3-Core/SQLite3Library.class.st	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #116   +/-   ##
=======================================
  Coverage   80.39%   80.39%           
=======================================
  Files         110      110           
  Lines        4530     4530           
=======================================
  Hits         3642     3642           
  Misses        888      888           

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