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/m2r/default.nix

@@ -0,0 +1,32 @@
+{ lib
+, buildPythonApplication
+, fetchFromGitHub
+, docutils
+, mistune
+, pygments
+}:
+
+buildPythonApplication rec {
+  pname = "m2r";
+  version = "0.2.1";
+
+  src = fetchFromGitHub {
+    owner = "miyakogi";
+    repo = pname;
+    rev = "v${version}";
+    hash = "sha256-JNLPEXMoiISh4RnKP+Afj9/PJp9Lrx9UYHsfuGAL7uI=";
+  };
+
+  buildInputs = [
+    docutils
+    mistune
+    pygments
+  ];
+
+  meta = with lib; {
+    homepage = "https://github.com/miyakogi/m2r";
+    description = "Markdown-to-RestructuredText converter";
+    license = licenses.mit;
+    maintainers = with maintainers; [ AndersonTorres ];
+  };
+}