fix a few issues with unit tests

Bartosz Podrygajlorequested to merge
unit-test-fixes into develop

Fix several issues with unit tests

  1. fix unused argument warnings - running ninja tests fails on my system due to too many warnings.
  2. fix google benchmark build - sometimes, when building from scratch the build will fail due to compiler warnings. I don't know why it only happens sometimes but I've instead added a warning suppression as this is not an issue in our code.
  3. fix memory leak I've found here: !3827 (comment 224369)
  4. fix running two testcases with ninja test or ctest -R. Due to them being dependent on dlopen they would automatically fail if the user environemnt was not modified manually outside cmake. I've modified LD_LIBRARY_PATH for those test cases, meaning you no longer need to run it with LD_LIBRARY_PATH=. or similar prefix.

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