uboot: (firmwareOdroidC2/C4) don't invoke patch tool, use patches = [] instead

https://github.com/NixOS/nixpkgs/blob/master/pkgs/stdenv/generic/setup.sh#L948
this can do it nicely.

Signed-off-by: Anton Arapov <anton@deadbeef.mx>

pkgs/tools/security/onlykey/default.nix

@@ -0,0 +1,63 @@
+{ fetchgit
+, lib
+, makeDesktopItem
+, node_webkit
+, pkgs
+, runCommand
+, stdenv
+, writeShellScript
+}:
+
+let
+  # parse the version from package.json
+  version =
+    let
+      packageJson = lib.importJSON ./package.json;
+      splits = builtins.split "^.*#v(.*)$" (builtins.getAttr "onlykey" (builtins.head packageJson));
+      matches = builtins.elemAt splits 1;
+      elem = builtins.head matches;
+    in
+    elem;
+
+  # this must be updated anytime this package is updated.
+  onlykeyPkg = "onlykey-git+https://github.com/trustcrypto/OnlyKey-App.git#v${version}";
+
+  # define a shortcut to get to onlykey.
+  onlykey = self."${onlykeyPkg}";
+
+  super = (import ./onlykey.nix {
+    inherit pkgs;
+    inherit (stdenv.hostPlatform) system;
+  });
+
+  self = super // {
+    "${onlykeyPkg}" = super."${onlykeyPkg}".override (attrs: {
+      # when installing packages, nw tries to download nwjs in its postInstall
+      # script. There are currently no other postInstall scripts, so this
+      # should not break other things.
+      npmFlags = attrs.npmFlags or "" + " --ignore-scripts";
+
+      # this package requires to be built in order to become runnable.
+      postInstall = ''
+        cd $out/lib/node_modules/${attrs.packageName}
+        npm run build
+      '';
+    });
+  };
+
+  script = writeShellScript "${onlykey.packageName}-starter-${onlykey.version}" ''
+    ${node_webkit}/bin/nw ${onlykey}/lib/node_modules/${onlykey.packageName}/build
+  '';
+
+  desktop = makeDesktopItem {
+    name = onlykey.packageName;
+    exec = script;
+    icon = "${onlykey}/lib/node_modules/${onlykey.packageName}/resources/onlykey_logo_128.png";
+    desktopName = onlykey.packageName;
+    genericName = onlykey.packageName;
+  };
+in
+runCommand "${onlykey.packageName}-${onlykey.version}" { } ''
+  mkdir -p $out/bin
+  ln -s ${script} $out/bin/onlykey
+''