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/flask-caching/default.nix

@@ -0,0 +1,30 @@
+{ lib, buildPythonPackage, fetchPypi, isPy27, flask, pytestCheckHook, pytest-cov, pytest-xprocess, pytestcache }:
+
+buildPythonPackage rec {
+  pname = "Flask-Caching";
+  version = "1.10.1";
+  disabled = isPy27; # invalid python2 syntax
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "cf19b722fcebc2ba03e4ae7c55b532ed53f0cbf683ce36fafe5e881789a01c00";
+  };
+
+  propagatedBuildInputs = [ flask ];
+
+  checkInputs = [ pytestCheckHook pytest-cov pytest-xprocess pytestcache ];
+
+  disabledTests = [
+    # backend_cache relies on pytest-cache, which is a stale package from 2013
+    "backend_cache"
+    # optional backends
+    "Redis"
+    "Memcache"
+  ];
+
+  meta = with lib; {
+    description = "Adds caching support to your Flask application";
+    homepage = "https://github.com/sh4nks/flask-caching";
+    license = licenses.bsd3;
+  };
+}