wrap: wraps from subprojects can replace directories found with no wrap

If main project finds a directory subprojects/foo with no corresponding
foo.wrap, it creates a dummy PackageDefinition for it. If we later find
a subproject that has foo.wrap, replace the dummy wrap with it.

This happens for example when wrap-redirect have been deleted. It also
happens for subprojects downloaded from some Cargo.lock which does not
create a wrap-redirect.

Avoid loading the same location twice, which can happen when preparing
cargo subprojects.

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