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/package-management/cargo-graph/default.nix

@@ -0,0 +1,22 @@
+{ lib, rustPlatform, fetchFromGitHub }:
+rustPlatform.buildRustPackage rec {
+  pname = "cargo-graph";
+  version = "0.2.0-d895af1";
+
+  src = fetchFromGitHub {
+    owner = "kbknapp";
+    repo = "cargo-graph";
+    # The last release (v0.2.0) is from 2015. Since then there have been some
+    # bug fixes committed that would be good to have.
+    rev = "d895af1b7840c7ae8eddaf4e990bfa594c22ba01";
+    sha256 = "0myg26cssmbakz53dl61lswsbaqnjqlbc30c2571pq8f7gvz2qv5";
+  };
+
+  cargoSha256 = "0wyvly7aq4njlxnmgpfgbh08fxgqh85kw7d938pm6qxmj27zn4p2";
+
+  meta = with lib; {
+    description = "A cargo subcommand for creating GraphViz DOT files and dependency graphs";
+    license = with licenses; [ mit ];
+    maintainers = with maintainers; [ basvandijk ];
+  };
+}