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/pygraphviz/default.nix

@@ -0,0 +1,52 @@
+{ lib
+, buildPythonPackage
+, isPy3k
+, fetchPypi
+, substituteAll
+, graphviz
+, coreutils
+, pkg-config
+, pytest
+}:
+
+buildPythonPackage rec {
+  pname = "pygraphviz";
+  version = "1.9";
+
+  disabled = !isPy3k;
+
+  src = fetchPypi {
+    inherit pname version;
+    hash = "sha256-+hj3xs6ig0Gk5GbtDPBWgrCmgoiv6N18lCZ4L3wa4Bw=";
+    extension = "zip";
+  };
+
+  patches = [
+    # pygraphviz depends on graphviz executables and wc being in PATH
+    (substituteAll {
+      src = ./path.patch;
+      path = lib.makeBinPath [ graphviz coreutils ];
+    })
+  ];
+
+  nativeBuildInputs = [ pkg-config ];
+
+  buildInputs = [ graphviz ];
+
+  checkInputs = [ pytest ];
+
+  checkPhase = ''
+    runHook preCheck
+    pytest --pyargs pygraphviz
+    runHook postCheck
+  '';
+
+  pythonImportsCheck = [ "pygraphviz" ];
+
+  meta = with lib; {
+    description = "Python interface to Graphviz graph drawing package";
+    homepage = "https://github.com/pygraphviz/pygraphviz";
+    license = licenses.bsd3;
+    maintainers = with maintainers; [ matthiasbeyer dotlambda ];
+  };
+}