Make repository compatible with gbp-buildpackage (Closes #1056782)

Gioele Barabuccirequested to merge
gioele/findutils:gbp-compat into master

This MR fixes two issues that make gbp-buildpackage fail to build findutils:

  1. dpkg-source blindly copies the top-level README.md file and the detects it as a local change, aborting the build process
  2. The fact that this a non-standard, non-DEP-14 repository is not documented in gbp.conf.

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