dh_setup_copyright: Track sources for files copied to the install prefix

In addition to scanning binary files, now we also try to match files directly copied to the install prefix to their original location, which will allow the BOM generation scripts in the images to track their copyright properly.

https://phabricator.apertis.org/T7616

Signed-off-by: Ryan Gonzalez ryan.gonzalez@collabora.com