Remove need for `(fake)root` when assembling the .deb

Niels Thykierrequested to merge
nthykier/duperemove:nthykier-master-patch-97574 into master

Hi @petzah

The package can successfully be built without needing (fake)root at any point of its build/assembly. Setting Rules-Requires-Root to no removes the implicit build dependency on fakeroot.

As useful as fakeroot has been, it is also quite fragile. As an example, a slightly out of date fakeroot can cause debs to be contaminated with non-root ownerships #1024544. Additionally, fakeroot has one open unfixed RC bug filed against it that has made it unable to migrate to testing for a while.

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