Google Test broke compiling on MacOS

[vvbandeira]

          This comit broke compling on MacOS.

"brew install googletest" is not suficcient, linking steps fail with

[ 73%] Built target odb_test_helper
ld: warning: ignoring duplicate libraries: '../../src/db/libdb.a', '../../src/zutil/libzutil.a'
ld: library 'gtest' not found

Originally posted by @stefanottili in https://github.com/The-OpenROAD-Project/OpenROAD/issues/5630#issuecomment-2305918314