nix1: don't deliver perl-bindings of nixStable (a.k.a nix2)

This causes collisions between the build outputs of `nix` when building
in an environment with `nix1.perl-bindings` and `nix`:

```
collision between `/nix/store/aa4rrcj7dg2xj4rfkiclcmp745ibqng0-nix-2.0.4/lib/libnixstore.so' and `/nix/store/sp0sdi4bll80h58big1iy8kkh3qqxpw2-nix-1.11.16/lib/libnixstore.so'
builder for '/nix/store/wgbccin107lhm8cv9imnnvkx1j2pgibc-hydra-perl-deps.drv' failed with exit code 25
```

1 files changed, 1 insertions, 1 deletions

diff --git a/pkgs/tools/package-management/nix/default.nix b/pkgs/tools/package-management/nix/default.nix
index 2302476eb91..56bfdb046a8 100644
--- a/pkgs/tools/package-management/nix/default.nix
+++ b/pkgs/tools/package-management/nix/default.nix
@@ -132,7 +132,7 @@ in rec {
       url = "http://nixos.org/releases/nix/${name}/${name}.tar.xz";
       sha256 = "0ca5782fc37d62238d13a620a7b4bff6a200bab1bd63003709249a776162357c";
     };
-  }) // { perl-bindings = nixStable; };
+  }) // { perl-bindings = nix1; };
 
   nixStable = (common rec {
     name = "nix-2.0.4";