Actually, prefer to get system from ...buildPlatform

We are going to run chromium during testing, so it's the build platform. If build != host, (which, granted, we don't yet run tests for) we could run the test app in an emulator, but there is no point running chromium in an emulator too, as JSaddle shouldn't care.

Author: Ericson2314

haskell-overlays/reflex-packages/default.nix

@@ -20,7 +20,7 @@ let
 
   inherit (nixpkgs) stdenv;
   # Older chromium for reflex-dom-core test suite
-  nixpkgs_oldChromium = import ../../nixpkgs-old-chromium { inherit (nixpkgs.stdenv) system; };
+  nixpkgs_oldChromium = import ../../nixpkgs-old-chromium { inherit (nixpkgs.stdenv.buildPlatform) system; };
 in
 {
   _dep = super._dep or {} // thunkSet ./dep;