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/pytest-xvfb/default.nix

@@ -0,0 +1,31 @@
+{ lib
+, buildPythonPackage
+, fetchPypi
+, pytest
+, virtual-display
+, isPy27
+}:
+
+buildPythonPackage rec {
+  pname = "pytest-xvfb";
+  version = "2.0.0";
+  disabled = isPy27;
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "1kyq5rg27dsnj7dc6x9y7r8vwf8rc88y2ppnnw6r96alw0nn9fn4";
+  };
+
+  buildInputs = [ pytest ];
+
+  propagatedBuildInputs = [
+    virtual-display
+  ];
+
+  meta = with lib; {
+    description = "A pytest plugin to run Xvfb for tests";
+    homepage = "https://github.com/The-Compiler/pytest-xvfb";
+    license = licenses.mit;
+    maintainers = with maintainers; [ costrouc ];
+  };
+}