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/networking/ngrok-2/default.nix

@@ -0,0 +1,47 @@
+{ lib, stdenv, fetchurl }:
+
+with lib;
+
+let versions = lib.importJSON ./versions.json;
+    arch = if stdenv.isi686 then "386"
+           else if stdenv.isx86_64 then "amd64"
+           else if stdenv.isAarch32 then "arm"
+           else if stdenv.isAarch64 then "arm64"
+           else throw "Unsupported architecture";
+    os = if stdenv.isLinux then "linux"
+         else if stdenv.isDarwin then "darwin"
+         else throw "Unsupported os";
+    versionInfo = versions."${os}-${arch}";
+    inherit (versionInfo) version sha256 url;
+
+in
+stdenv.mkDerivation {
+  pname = "ngrok";
+  inherit version;
+
+  # run ./update
+  src = fetchurl { inherit sha256 url; };
+
+  sourceRoot = ".";
+
+  unpackPhase = "cp $src ngrok";
+
+  buildPhase = "chmod a+x ngrok";
+
+  installPhase = ''
+    install -D ngrok $out/bin/ngrok
+  '';
+
+  passthru.updateScript = ./update.sh;
+
+  # Stripping causes SEGFAULT on x86_64-darwin
+  dontStrip = true;
+
+  meta = {
+    description = "Allows you to expose a web server running on your local machine to the internet";
+    homepage = "https://ngrok.com/";
+    license = licenses.unfree;
+    platforms = [ "i686-linux" "x86_64-linux" "aarch64-linux" "x86_64-darwin" "aarch64-darwin" ];
+    maintainers = [ maintainers.bobvanderlinden ];
+  };
+}