chromium: move ed and makeWrapper into nativeBuildInputs

This most notably fixes cross _evaluation_ of chromium which previously
would fail because makeWrapper relies on runtimeShell which is not
available in the HostTarget package set.

I tested that the native chromium build still works, but haven't tried
cross compiling it yet. There very well may be additional errors, but at
least they will be build errors, not hard to understand evaluation
errors.

pkgs/applications/networking/browsers/chromium/default.nix

@@ -149,9 +149,11 @@ in stdenv.mkDerivation {
     + "chromium${suffix}-${version}";
   inherit version;
 
-  buildInputs = [
+  nativeBuildInputs = [
     makeWrapper ed
+  ];
 
+  buildInputs = [
     # needed for GSETTINGS_SCHEMAS_PATH
     gsettings-desktop-schemas glib gtk3