Avoid non current system platform in the recursive nix

Author: hamishmack

nix-tools/flake.nix

@@ -78,7 +78,7 @@
       hydraJobs = forAllSystems
         (pkgs:
           # project's hydraJobs
-          pkgs.nix-tools-unchecked.project.flake'.hydraJobs
+          pkgs.nix-tools-eval-on-linux.project.flake'.hydraJobs
           # tarballs with static builds.
           // lib.optionalAttrs (pkgs.buildPlatform.system == "x86_64-linux")
             { binary-tarball = mkTarball pkgs.pkgsCross.musl64; }

nix-tools/overlay.nix

@@ -9,6 +9,10 @@ let
 
   nix-tools-unchecked = nix-tools-set {};
 
+  nix-tools-eval-on-linux = nix-tools-set {
+    evalSystem = builtins.currentSystem or "x86_64-linux";
+  };
+
   nix-tools-set = args:
     let
       project = final.haskell-nix.cabalProject'
@@ -23,8 +27,6 @@ let
             # tests need to fetch hackage
             configureArgs = final.lib.mkDefault "--disable-tests";
 
-            evalSystem = builtins.currentSystem or "x86_64-linux";
-
             # Tools to include in the development shell
             shell.tools.cabal = "latest";
           }
@@ -83,5 +85,5 @@ let
     toolset // warning;
 in
 {
-  inherit nix-tools nix-tools-unchecked nix-tools-set;
+  inherit nix-tools nix-tools-unchecked nix-tools-eval-on-linux nix-tools-set;
 }