Fix #20855: -v command line switch should show import sources

[dkorpel]

No description provided.

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Testing this PR locally

If you don't have a local development environment setup, you can use Digger to test this PR:

dub run digger -- build "master + dmd#20873"

[dkorpel]

This results in linker errors on buildkite. 🤨 Is dub parsing -v output to find dependencies?!

[MrcSnm]

Looks like more of a problem on those compiler aware projects, looks hard to update that