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/pyuavcan/default.nix

@@ -0,0 +1,50 @@
+{ lib, buildPythonPackage, fetchFromGitHub, pythonOlder, numpy, nunavut
+, pyserial , pytest, ruamel-yaml}:
+
+ buildPythonPackage rec {
+  pname = "pyuavcan";
+  version = "1.1.0.dev1";
+  disabled = pythonOlder "3.7"; # only python>=3.7 is supported
+
+  src = fetchFromGitHub {
+    owner = "UAVCAN";
+    repo = pname;
+    rev = version;
+    sha256 = "0fmbmdnnh679zkllv5m6pkrasg7m9vjwabqnmz5m7flrgdh6h4qa";
+  };
+
+  propagatedBuildInputs = [
+    numpy
+    nunavut
+    pyserial
+    pytest
+    ruamel-yaml
+  ];
+
+  # allow for writable directory for darwin
+  preBuild = ''
+    export HOME=$TMPDIR
+    export PYTHONASYNCIODEBUG=1
+  '';
+
+  # tests fail ATM.
+  doCheck = false;
+
+  # check at least that import works, as tests fail
+  pythonImportsCheck = [
+    "pyuavcan"
+  ];
+
+  meta = with lib; {
+    description = "A full-featured implementation of the UAVCAN protocol stack";
+    longDescription = ''
+      It is intended for non-embedded, user-facing applications such as GUI
+      software, diagnostic tools, automation scripts, prototypes, and various
+      R&D cases.  PyUAVCAN consists of a Python library (package) and a simple
+      CLI tool for basic diagnostics and shell script automation.
+    '';
+    homepage = "https://pyuavcan.readthedocs.io";
+    maintainers = with maintainers; [ wucke13 ];
+    license = licenses.mit;
+  };
+}