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/snapshottest/default.nix

@@ -0,0 +1,33 @@
+{ lib
+, buildPythonPackage
+, fetchPypi
+, fastdiff
+, six
+, termcolor
+, pytestCheckHook
+, pytest-cov
+, django
+}:
+
+buildPythonPackage rec {
+  pname = "snapshottest";
+  version = "0.6.0";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "0g35ggqw4jd9zmazw55kj6gfjdghv49qx4jw5q231qyqj8fzijmv";
+  };
+
+  propagatedBuildInputs = [ fastdiff six termcolor ];
+
+  checkInputs = [ django pytestCheckHook pytest-cov ];
+
+  pythonImportsCheck = [ "snapshottest" ];
+
+  meta = with lib; {
+    description = "Snapshot testing for pytest, unittest, Django, and Nose";
+    homepage = "https://github.com/syrusakbary/snapshottest";
+    license = licenses.mit;
+    maintainers = with maintainers; [ SuperSandro2000 ];
+  };
+}