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/ejson/default.nix

@@ -0,0 +1,43 @@
+{ lib, bundlerEnv, ruby, buildGoModule, fetchFromGitHub }:
+let
+  # needed for manpage generation
+  gems = bundlerEnv {
+    name = "ejson-gems";
+    gemdir = ./.;
+    inherit ruby;
+  };
+in
+buildGoModule rec {
+  pname = "ejson";
+  version = "1.3.3";
+
+  src = fetchFromGitHub {
+    owner = "Shopify";
+    repo = "ejson";
+    rev = "v${version}";
+    sha256 = "sha256-M2Gk+/l1tNlIAe1/fR1WLEOey+tjCUmMAujc76gmeZA=";
+  };
+
+  vendorSha256 = "sha256-9+x7HrbXRoS/7ZADWwhsbynQLr3SyCbcsp9QnSubov0=";
+
+  nativeBuildInputs = [ gems ];
+
+  ldflags = [ "-s" "-w" ];
+
+  # set HOME, otherwise bundler will insert stuff in the manpages
+  postBuild = ''
+    HOME=$PWD make man SHELL=$SHELL
+  '';
+
+  postInstall = ''
+    mkdir -p $out/share
+    cp -r build/man $out/share
+  '';
+
+  meta = with lib; {
+    description = "A small library to manage encrypted secrets using asymmetric encryption";
+    license = licenses.mit;
+    homepage = "https://github.com/Shopify/ejson";
+    maintainers = [ maintainers.manveru ];
+  };
+}