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/python-modules/pure-eval/default.nix

@@ -0,0 +1,45 @@
+{ lib
+, buildPythonPackage
+, isPy3k
+, fetchFromGitHub
+, setuptools-scm
+, toml
+, pytestCheckHook
+}:
+
+buildPythonPackage rec {
+  pname = "pure_eval";
+  version = "0.2.1";
+
+  disabled = !isPy3k;
+
+  src = fetchFromGitHub {
+    owner = "alexmojaki";
+    repo = pname;
+    rev = "v${version}";
+    sha256 = "sha256-+Vucu16NFPtQ23AbBH/cQU+klxp6DMicSScbnKegLZI=";
+  };
+
+  SETUPTOOLS_SCM_PRETEND_VERSION = version;
+
+  buildInputs = [
+    setuptools-scm
+  ];
+
+  propagatedBuildInputs = [
+    toml
+  ];
+
+  checkInputs = [
+    pytestCheckHook
+  ];
+
+  pythonImportsCheck = [ "pure_eval" ];
+
+  meta = with lib; {
+    description = "Safely evaluate AST nodes without side effects";
+    homepage = "https://github.com/alexmojaki/pure_eval";
+    license = licenses.mit;
+    maintainers = with maintainers; [ gebner ];
+  };
+}