Move this into a let binding and reuse it further down in
defaultCrateOverridesForPkgs, rather than going through the fixpoint.
Change-Id: I9df86189ee788adbecfabf64a09463103e4a626f
Reviewed-on: https://cl.snix.dev/c/snix/+/30103
Autosubmit: Florian Klink <flokli@flokli.de>
Tested-by: besadii
Reviewed-by: Vova Kryachko <v.kryachko@gmail.com>
nixpkgs has merged their sdks together, and it doesn't need to be
specified anymore at all, as it's added to stdenv by default.
Explicitly configuring a specific version is only needed if we want to
override the version.
Change-Id: Iff7f2da43733eb48f16d2483587518f00761fb91
Reviewed-on: https://cl.snix.dev/c/snix/+/30096
Tested-by: besadii
Reviewed-by: Vova Kryachko <v.kryachko@gmail.com>
