get_software_libdir: return dir if it's only 1 with libs
#4513
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There are situations e.g. with recent Gentoo where all 64-bit libraries are under `lib64`, but `lib` is seperate and used for other files and directories (e.g. `lib/python`), and for 32-bit libraries. `get_software_libdir` would fail for such. To avoid this: if `only_one` is `True` (default), *and* no specific file (`fs`) is specified (also default), *and* `lib` and `lib64` both exist and are separate, and only one of them has libraries (shared or static), it returns that one directory.
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There are situations e.g. with recent Gentoo where all 64-bit libraries are under
lib64, butlibis seperate and used for other files and directories (e.g.lib/python), and for 32-bit libraries.get_software_libdirwould fail for such. To avoid this:if
only_oneisTrue(default), and no specific file (fs) is specified (also default), andlibandlib64both exist and are separate, and only one of them has libraries (shared or static), it returns that one directory.