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/python-snappy/default.nix

@@ -0,0 +1,36 @@
+{ lib
+, buildPythonPackage
+, fetchPypi
+, isPyPy
+, snappy
+, cffi
+, python
+}:
+
+buildPythonPackage rec {
+  pname = "python-snappy";
+  version = "0.6.1";
+  format = "setuptools";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "sha256-tqEHqwYgasxTWdTFYyvZsi1EhwKnmzFpsMYuD7gIuyo=";
+  };
+
+  buildInputs = [ snappy ];
+
+  propagatedBuildInputs = lib.optional isPyPy cffi;
+
+  checkPhase = ''
+    runHook preCheck
+    ${python.interpreter} -m unittest discover
+    runHook postCheck
+  '';
+
+  meta = with lib; {
+    description = "Python library for the snappy compression library from Google";
+    homepage = "https://github.com/andrix/python-snappy";
+    license = licenses.bsd3;
+    maintainers = with maintainers; [ costrouc ];
+  };
+}