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/dot2tex/default.nix

@@ -0,0 +1,46 @@
+{ lib
+, python
+, buildPythonPackage
+, fetchPypi
+, substituteAll
+, pyparsing
+, graphviz
+, texlive
+}:
+
+buildPythonPackage rec {
+  pname = "dot2tex";
+  version = "2.11.3";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "1kp77wiv7b5qib82i3y3sn9r49rym43aaqm5aw1bwnzfbbq2m6i9";
+  };
+
+  patches = [
+    (substituteAll {
+      src = ./path.patch;
+      inherit graphviz;
+    })
+    ./test.patch # https://github.com/kjellmf/dot2tex/issues/5
+  ];
+
+  propagatedBuildInputs = [ pyparsing ];
+
+  checkInputs = [
+    (texlive.combine {
+      inherit (texlive) scheme-small preview pstricks;
+    })
+  ];
+
+  checkPhase = ''
+    ${python.interpreter} tests/test_dot2tex.py
+  '';
+
+  meta = with lib; {
+    description = "Convert graphs generated by Graphviz to LaTeX friendly formats";
+    homepage = "https://github.com/kjellmf/dot2tex";
+    license = licenses.mit;
+  };
+
+}