## Description
Fixes#5802.
Today, tests fail on most Windows machines because we hard-code `D:` as
the root drive, but most machines use `C:`. This change uses the same
normalization function in the test assertion to ensure the drives match.
## To Do
- [ ] ~~Documentation.~~
- [x] Changelog.
- [x] Tests. (this is a tests change)
## What changed?
* Updated tests to generate the drive name via normalization, instead of
hard-coding `D:`.
* Updated the `Item::destination()` method to document the
`relative_to_libdir` param.
## How tested?
* [x] Tests pass locally.
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