This reverts commit 79759fea, reversing
changes made to dc36f4df.

- Update CMakeLists.txt (original template and generated code)
  to prevent forcefully linking `dl` on all UNIX platforms,
  and rely on `${CMAKE_DL_LIBS}` portable variable instead.
- Do not try linking against `librt` on macOS.
- Add a `config_freebsd` directory containing the header file
  generated by the `configure` script for the `ares` library.

Also add some missing rules in test/core/slice/BUILD.

trying to fix some sanity

nope that didn't work

fixing test failiures

added debug code

more trail and error

more trial and error

cleaning debug code