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This does two things:
* allows the library files to be symlinks
* searches `lib` and `lib64` in `BOOST_ROOT` even if it finds lib
directories from the compiler
The first condition is needed for the homebrew on macOS because boost and boost
python are provided in seperate packages and are put together in /usr/local/lib
with symlinks to the library files. The both conditions are needed for high
performace computing environments where dependencies are often provided in
nonstandard directories with symlinks
A test case was added which looks for boost libraries in seperate directories
which have been symlinked to BOOST_ROOT/lib
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