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/sigtools/default.nix

@@ -0,0 +1,36 @@
+{ lib
+, buildPythonPackage
+, fetchPypi
+, sphinx
+, mock
+, coverage
+, unittest2
+, funcsigs
+, six
+}:
+
+buildPythonPackage rec {
+  pname = "sigtools";
+  version = "2.0.3";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "e7789628ec0d02e421bca76532b0d5da149f96f09e7ed4a5cbf318624b75e949";
+  };
+
+  propagatedBuildInputs = [ funcsigs six ];
+
+  patchPhase = ''sed -i s/test_suite="'"sigtools.tests"'"/test_suite="'"unittest2.collector"'"/ setup.py'';
+
+  # repeated_test no longer exists in nixpkgs
+  # Also see: https://github.com/epsy/sigtools/issues/26
+  doCheck = false;
+  checkInputs = [ sphinx mock coverage unittest2 ];
+
+  meta = with lib; {
+    description = "Utilities for working with 3.3's inspect.Signature objects.";
+    homepage = "https://pypi.python.org/pypi/sigtools";
+    license = licenses.mit;
+  };
+
+}