Bugfix: sanitize_dir: use pathlib to handle case-insensitive filesystems #6398
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fixes #6395
The unit tests needed to be updated to accurately reflect Windows path behavior. The prior method was fine for Posix-like filesystems, but conflicted with the distinct behavior of Windows paths respected in Python pathlib. This issue creeps up from time to time as we continue to implement pathlib inside Meson, this is just one step in that transition.
d31cbf6 was just an obvious change for unreachable/dead code I happened across.
I would suggest squashing these commits if desired, either way is fine. I just left them unsquashed to show the various steps needed to remove always-Posix assumptions from the relevant code.