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/rust/racer/default.nix

@@ -0,0 +1,50 @@
+{ lib, rustPlatform, fetchCrate, makeWrapper, stdenv, Security }:
+
+rustPlatform.buildRustPackage rec {
+  pname = "racer";
+  version = "2.2.1";
+
+  src = fetchCrate {
+    inherit pname version;
+    sha256 = "sha256-uAVtJwOyhe1lPz+MUUFCgHJPVGuIk/lNUkQWiNdOZ5Y=";
+  };
+
+  cargoSha256 = "sha256-U2mI1y6t8CwxW/iPcPzxAafu61GNm/XLCKVGuyybV/4=";
+
+  nativeBuildInputs = [ makeWrapper ];
+  buildInputs = lib.optional stdenv.isDarwin Security;
+
+  # a nightly compiler is required unless we use this cheat code.
+  RUSTC_BOOTSTRAP = 1;
+
+  RUST_SRC_PATH = rustPlatform.rustLibSrc;
+  postInstall = ''
+    wrapProgram $out/bin/racer --set-default RUST_SRC_PATH ${rustPlatform.rustLibSrc}
+  '';
+
+  checkFlags = [
+    "--skip nameres::test_do_file_search_std"
+    "--skip util::test_get_rust_src_path_rustup_ok"
+    "--skip util::test_get_rust_src_path_not_rust_source_tree"
+    "--skip extern --skip completes_pub_fn --skip find_crate_doc"
+    "--skip follows_use_local_package --skip follows_use_for_reexport"
+    "--skip follows_rand_crate --skip get_completion_in_example_dir"
+    "--skip test_resolve_global_path_in_modules"
+  ];
+
+  # [2022-04-06] Its test suite contains two function calls with the
+  # wrong number of arguments, breaking its build.
+  doCheck = false;
+
+  doInstallCheck = true;
+  installCheckPhase = ''
+    $out/bin/racer --version
+  '';
+
+  meta = with lib; {
+    description = "A utility intended to provide Rust code completion for editors and IDEs";
+    homepage = "https://github.com/racer-rust/racer";
+    license = licenses.mit;
+    maintainers = with maintainers; [ jagajaga ];
+  };
+}