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/text/mdbook-plantuml/default.nix

@@ -0,0 +1,28 @@
+{ lib, fetchFromGitHub, stdenv, rustPlatform, darwin, pkg-config, openssl
+, libiconv, CoreServices }:
+
+rustPlatform.buildRustPackage rec {
+  pname = "mdbook-plantuml";
+  version = "0.7.0";
+
+  src = fetchFromGitHub {
+    owner = "sytsereitsma";
+    repo = pname;
+    rev = "v${version}";
+    sha256 = "1m53sp3k387injn6mwk2c6rkzw16b12m4j7q0p69fdb3fiqbkign";
+  };
+
+  cargoSha256 = "0xi14k86ym3rfz6901lmj444y814m7vp90bwsyjmcph3hdv6mjp0";
+
+  nativeBuildInputs = [ pkg-config ];
+
+  buildInputs = [ openssl ]
+    ++ lib.optionals stdenv.isDarwin [ CoreServices ];
+
+  meta = with lib; {
+    description = "mdBook preprocessor to render PlantUML diagrams to png images in the book output directory";
+    homepage = "https://github.com/sytsereitsma/mdbook-plantuml";
+    license = [ licenses.mit ];
+    maintainers = with maintainers; [ jcouyang ];
+  };
+}