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/graphite_beacon/default.nix

@@ -0,0 +1,33 @@
+{ lib, buildPythonPackage, fetchPypi
+, tornado_5, pyyaml, funcparserlib
+, nixosTests
+}:
+
+buildPythonPackage rec {
+  pname = "graphite_beacon";
+  version = "0.27.0";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "03bp4wyfn3xhcqyvs5hnk1n87m4smsmm1p7qp459m7j8hwpbq2ks";
+  };
+
+  propagatedBuildInputs = [ tornado_5 pyyaml funcparserlib ];
+
+  postPatch = ''
+    substituteInPlace requirements.txt --replace "==" ">="
+  '';
+
+  pythonImportsCheck = [ "graphite_beacon" ];
+
+  passthru.tests = {
+    nixos = nixosTests.graphite;
+  };
+
+  meta = with lib; {
+    description = "A simple alerting application for Graphite metrics";
+    homepage = "https://github.com/klen/graphite-beacon";
+    maintainers = [ maintainers.offline ];
+    license = licenses.mit;
+  };
+}