Fix bz2.dll install path for windows-cpp archive #4685
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In Windows, bz2.dll is incorrectly placed in install/lib, instead of install/bin. This causes "missing DLL error at runtime" kind of issues for binaries linking dynamically to OR-Tools 9.13 through CMake.
This issue was reported in 2022 in bzip2's official repository, but it was ignored by bzip2's maintainers.
bzip2 was introduced as a dependency of OR-Tools from v9.13, which is why we have this problem right now.
Example of this or-tools_x64_VisualStudio2022_cpp_v9.13.4784.zip