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/knack/default.nix

@@ -0,0 +1,52 @@
+{ lib
+, buildPythonPackage
+, fetchPypi
+, argcomplete
+, colorama
+, jmespath
+, pygments
+, pyyaml
+, six
+, tabulate
+, mock
+, vcrpy
+, pytest
+}:
+
+buildPythonPackage rec {
+  pname = "knack";
+  version = "0.9.0";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "7fcab17585c0236885eaef311c01a1e626d84c982aabcac81703afda3f89c81f";
+  };
+
+  propagatedBuildInputs = [
+    argcomplete
+    colorama
+    jmespath
+    pygments
+    pyyaml
+    six
+    tabulate
+  ];
+
+  checkInputs = [
+    mock
+    vcrpy
+    pytest
+  ];
+
+  checkPhase = ''
+    HOME=$TMPDIR pytest .
+  '';
+
+  meta = with lib; {
+    homepage = "https://github.com/microsoft/knack";
+    description = "A Command-Line Interface framework";
+    platforms = platforms.all;
+    license = licenses.mit;
+    maintainers = with maintainers; [ jonringer ];
+  };
+}