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/development/tools/gron/default.nix

@@ -0,0 +1,29 @@
+{ lib, buildGoModule, fetchFromGitHub }:
+
+buildGoModule rec {
+  pname = "gron";
+  version = "0.7.1";
+
+  src = fetchFromGitHub {
+    owner = "tomnomnom";
+    repo = "gron";
+    rev = "v${version}";
+    sha256 = "sha256-ZkAfAQsaFX7npyDcBDFS4Xa8kOMVH6yGfxGD7c0iQ+o=";
+  };
+
+  vendorSha256 = "sha256-K/QAG9mCIHe7PQhex3TntlGYAK9l0bESWk616N97dBs=";
+
+  meta = with lib; {
+    description = "Make JSON greppable!";
+    longDescription = ''
+      gron transforms JSON into discrete assignments to make it easier to grep
+      for what you want and see the absolute 'path' to it. It eases the
+      exploration of APIs that return large blobs of JSON but have terrible
+      documentation.
+    '';
+    homepage = "https://github.com/tomnomnom/gron";
+    license = licenses.mit;
+    maintainers = with maintainers; [ fgaz SuperSandro2000 ];
+    platforms = platforms.unix;
+  };
+}