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/misc/bkyml/default.nix

@@ -0,0 +1,45 @@
+{ lib
+, python3
+}:
+
+with python3.pkgs;
+
+buildPythonApplication rec {
+  pname = "bkyml";
+  version = "1.4.3";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "01kpx35572mp4xl2fjyvfk39jfgfjcyzymbifk76891kaqkjb7r9";
+  };
+
+  # The pyscaffold is not a runtime dependency but just a python project bootstrapping tool. Thus,
+  # instead of implement this package in nix we remove a dependency on it and fix up the version
+  # of the package, that has been affected by the pyscaffold package dependency removal.
+  postPatch = ''
+    substituteInPlace setup.py \
+      --replace "['pyscaffold>=3.0a0,<3.1a0'] + " "" \
+      --replace "use_pyscaffold=True"  ""
+    substituteInPlace src/bkyml/skeleton.py --replace \
+        "from bkyml import __version__" \
+        "__version__ = \"${version}\""
+  '';
+
+  # Don't run tests because they are broken when run within
+  # buildPythonApplication for reasons I don't quite understand.
+  doCheck = false;
+
+  pythonImportsCheck = [ "bkyml" ];
+
+  propagatedBuildInputs = [
+    ruamel-yaml
+    setuptools
+  ];
+
+  meta = with lib; {
+    homepage = "https://github.com/joscha/bkyml";
+    description = "A CLI tool to generate a pipeline.yaml file for Buildkite on the fly.";
+    license = licenses.mit;
+    maintainers = with maintainers; [ olebedev ];
+  };
+}