Use find_library() for log4c only if necessary

[lgbaldoni]

No description provided.

[tizonia]

Thanks!

[codecov]

Codecov Report

Merging #659 into meson will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##            meson     #659   +/-   ##
=======================================
  Coverage   37.27%   37.27%           
=======================================
  Files         371      371           
  Lines       49389    49389           
=======================================
  Hits        18412    18412           
  Misses      30977    30977

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