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/python2-modules/pyyaml/default.nix

@@ -0,0 +1,38 @@
+{ lib
+, buildPythonPackage
+, fetchFromGitHub
+, cython
+, libyaml
+, isPy27
+, python
+}:
+
+buildPythonPackage rec {
+  pname = "PyYAML";
+  version = "5.4.1.1";
+
+  src = fetchFromGitHub {
+    owner = "yaml";
+    repo = "pyyaml";
+    rev = version;
+    sha256 = "1v386gzdvsjg0mgix6v03rd0cgs9dl81qvn3m547849jm8r41dx8";
+  };
+
+  nativeBuildInputs = [ cython ];
+
+  buildInputs = [ libyaml ];
+
+  checkPhase = ''
+    runHook preCheck
+    PYTHONPATH=""tests/lib":$PYTHONPATH" ${python.interpreter} -m test_all
+    runHook postCheck
+  '';
+
+  pythonImportsCheck = [ "yaml" ];
+
+  meta = with lib; {
+    description = "The next generation YAML parser and emitter for Python";
+    homepage = "https://github.com/yaml/pyyaml";
+    license = licenses.mit;
+  };
+}