fix(nix/buildLisp): don't emit a target for impl used at top level r/3328

These targets would be the same derivation, but named differently which
is noisy and causes a few, mostly subtle issues:

* Buildkite struggles with large pipelines a bit, we can save quite a
  few steps by removing these.

* Having two jobs for the same derivation sometimes causes the annoying
  situation that an agent would do nothing except waiting for a lock.

* Non-nix CI we add in the future may not be able to recognize that
  these targets are the same and do extra work unnecessarily.

Change-Id: I1103e719ade1d3859d222b713969ac34a8765cba
Reviewed-on: https://cl.tvl.fyi/c/depot/+/4515
Autosubmit: sterni <sternenseemann@systemli.org>
Tested-by: BuildkiteCI
Reviewed-by: tazjin <mail@tazj.in>

0 files changed, 0 insertions, 0 deletions