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/backports_abc/default.nix

@@ -0,0 +1,25 @@
+{ lib
+, buildPythonPackage
+, fetchPypi
+, python
+}:
+
+buildPythonPackage rec {
+  pname = "backports_abc";
+  version = "0.5";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "033be54514a03e255df75c5aee8f9e672f663f93abb723444caec8fe43437bde";
+  };
+
+  checkPhase = ''
+    ${python.interpreter} -m unittest discover
+  '';
+
+  meta = {
+    homepage = "https://github.com/cython/backports_abc";
+    license = lib.licenses.psfl;
+    description = "A backport of recent additions to the 'collections.abc' module";
+  };
+}