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/interpreters/evcxr/default.nix

@@ -0,0 +1,41 @@
+{ cargo, fetchFromGitHub, makeWrapper, pkg-config, rustPlatform, lib, stdenv
+, gcc, cmake, libiconv, CoreServices, Security }:
+
+rustPlatform.buildRustPackage rec {
+  pname = "evcxr";
+  version = "0.12.0";
+
+  src = fetchFromGitHub {
+    owner = "google";
+    repo = "evcxr";
+    rev = "v${version}";
+    sha256 = "sha256-sD/eykXoeJq43o3xyFx2VIoH+xZrMmb6vZKVt4CO7B4=";
+  };
+
+  cargoSha256 = "sha256-eySdhzavm9NGv2xjgdq/C2iv6lxdulhgYNs9ehnSzKQ=";
+
+  RUST_SRC_PATH = "${rustPlatform.rustLibSrc}";
+
+  nativeBuildInputs = [ pkg-config makeWrapper cmake ];
+  buildInputs = lib.optionals stdenv.isDarwin
+    [ libiconv CoreServices Security ];
+
+  postInstall = let
+    wrap = exe: ''
+      wrapProgram $out/bin/${exe} \
+        --prefix PATH : ${lib.makeBinPath [ cargo gcc ]} \
+        --set-default RUST_SRC_PATH "$RUST_SRC_PATH"
+    '';
+  in ''
+    ${wrap "evcxr"}
+    ${wrap "evcxr_jupyter"}
+    rm $out/bin/testing_runtime
+  '';
+
+  meta = with lib; {
+    description = "An evaluation context for Rust";
+    homepage = "https://github.com/google/evcxr";
+    license = licenses.asl20;
+    maintainers = with maintainers; [ protoben ma27 ];
+  };
+}