9353: Include extra targets when the pkg_root is not the same as the target root. r=matklad a=rezural
Fixes#7715
For example, if a sub-crate includes sets the path='../somewhere-else/lib.rs', the files will not be in pkg_root , but in the target root's parent.
It may actually be in root.parent().parent(), I'm not sure about that.
At the moment it is just a fix, are there any relevant tests that this could go in? I've got about 1 brain cell left... but im happy to add tests where appropriate.
Co-authored-by: rezural <rezural@protonmail.com>
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