As of 6041cfe, the upstream-info.nix (back then it was called
sources.nix) is no longer in the source/ subdirectory, so we need to fix
that comment to say that the file is autogenerated from update.sh in the
*same* directory.
Signed-off-by: aszlig <aszlig@redmoonstudios.org>
The "sources.nix" also contains information about where to get binary
packages, so calling it "upstream-info.nix" fits better in terms of
naming.
Also, we're moving it away from the sources dir, because the latter will
soon vanish.
Signed-off-by: aszlig <aszlig@redmoonstudios.org>