c21b1ede95
Since e95f17e2720e67e2eabd59d7754c814d3e27a0b2, Go packages no longer contain the source tree, however Boulder seems to need that as it generates a few files during build. Ideally we would only pick the files that are needed and put it into a separate output, but I currently don't have time for this so I'm marking this with XXX to get back to it later. Signed-off-by: aszlig <aszlig@nix.build>