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/nunavut/default.nix

@@ -0,0 +1,50 @@
+{ lib
+, buildPythonPackage
+, pythonOlder
+, fetchPypi
+, importlib-resources
+, pydsdl
+, pyyaml
+}:
+
+ buildPythonPackage rec {
+  pname = "nunavut";
+  version = "1.7.5";
+
+  disabled = pythonOlder "3.5";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "sha256-4wZfj2C6aUNqHaA00KiiXbKOMf/XBSD0N2+9c++e0K8=";
+  };
+
+  propagatedBuildInputs = [
+    importlib-resources
+    pydsdl
+    pyyaml
+  ];
+
+  # allow for writable directory for darwin
+  preBuild = ''
+    export HOME=$TMPDIR
+  '';
+
+  # No tests in pypy package and no git tags yet for release versions, see
+  # https://github.com/UAVCAN/nunavut/issues/182
+  doCheck = false;
+
+  pythonImportsCheck = [
+    "nunavut"
+  ];
+
+  meta = with lib; {
+    description = "A UAVCAN DSDL template engine";
+    longDescription = ''
+      It exposes a pydsdl abstract syntax tree to Jinja2 templates allowing
+      authors to generate code, schemas, metadata, documentation, etc.
+    '';
+    homepage = "https://nunavut.readthedocs.io/";
+    maintainers = with maintainers; [ wucke13 ];
+    license = with licenses; [ bsd3 mit ];
+  };
+}