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/cymem/default.nix

@@ -0,0 +1,39 @@
+{ lib
+, buildPythonPackage
+, fetchFromGitHub
+, cython
+, python
+}:
+
+buildPythonPackage rec {
+  pname = "cymem";
+  version = "2.0.3";
+
+  src = fetchFromGitHub {
+    owner = "explosion";
+    repo = "cymem";
+    rev = "v${version}";
+    sha256 = "0cqz6whq4zginxjnh4cfqlsh535p4qz295ymvjchp71fv8mz11f6";
+  };
+
+  propagatedBuildInputs = [
+    cython
+  ];
+
+  prePatch = ''
+    substituteInPlace setup.py \
+      --replace "wheel>=0.32.0,<0.33.0" "wheel>=0.31.0"
+  '';
+
+  checkPhase = ''
+    cd cymem/tests
+    ${python.interpreter} -m unittest discover -p "*test*"
+  '';
+
+  meta = with lib; {
+    description = "Cython memory pool for RAII-style memory management";
+    homepage = "https://github.com/explosion/cymem";
+    license = licenses.mit;
+    maintainers = with maintainers; [ ];
+  };
+}