release.nix: pass missing parameter

Commit 5643714 introduced a tiny
bug, neglecting to pass the `pkgs` parameter to `release.nix`.

This bug went unnoticed because commit
e663518 had introduced a much larger
bug: an attribute collision resulted in `stdenvBootstrapTools` being
shadowed, and therefore never evaluated.  As a result, the missing
`pkgs` parameter did not lead to an error.

This commit passes the missing parameter so that fixing the
larger/earlier bug will not cause an eval failure.

pkgs/top-level/release.nix

@@ -167,15 +167,19 @@ let
           (system: {
             inherit
               (import ../stdenv/linux/make-bootstrap-tools.nix {
-                localSystem = { inherit system; };
+                pkgs = import ../.. {
+                  localSystem = { inherit system; };
+                };
               })
               dist test;
           })
         # darwin is special in this
         // optionalAttrs supportDarwin.x86_64 {
           x86_64-darwin =
             let
-              bootstrap = import ../stdenv/darwin/make-bootstrap-tools.nix { system = "x86_64-darwin"; };
+              bootstrap = import ../stdenv/darwin/make-bootstrap-tools.nix {
+                localSystem = { system = "x86_64-darwin"; };
+              };
             in {
               # Lightweight distribution and test
               inherit (bootstrap) dist test;
@@ -186,7 +190,10 @@ let
           # Cross compiled bootstrap tools
           aarch64-darwin =
             let
-              bootstrap = import ../stdenv/darwin/make-bootstrap-tools.nix { system = "x86_64-darwin"; crossSystem = "aarch64-darwin"; };
+              bootstrap = import ../stdenv/darwin/make-bootstrap-tools.nix {
+                localSystem = { system = "x86_64-darwin"; };
+                crossSystem = { system = "aarch64-darwin"; };
+              };
             in {
               # Distribution only for now
               inherit (bootstrap) dist;