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/keystone-engine/default.nix

@@ -0,0 +1,30 @@
+{ lib, stdenv, buildPythonPackage, fetchPypi, keystone }:
+
+buildPythonPackage rec {
+  pname = "keystone-engine";
+  version = "0.9.2";
+
+  src = fetchPypi {
+   inherit pname version;
+   sha256 = "1xahdr6bh3dw5swrc2r8kqa8ljhqlb7k2kxv5mrw5rhcmcnzcyig";
+  };
+
+  setupPyBuildFlags = lib.optionals stdenv.isLinux [ "--plat-name" "linux" ];
+
+  preConfigure = ''
+    substituteInPlace setup.py --replace \
+      "libkeystone" "${keystone}/lib/libkeystone"
+  '';
+
+  # No tests
+  doCheck = false;
+
+  pythonImportsCheck = [ "keystone" ];
+
+  meta = with lib; {
+    description = "Lightweight multi-platform, multi-architecture assembler framework";
+    homepage = "https://www.keystone-engine.org";
+    maintainers = with maintainers; [ dump_stack ];
+    license = licenses.gpl2Only;
+  };
+}