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/pyvex/default.nix

@@ -0,0 +1,63 @@
+{ lib
+, stdenv
+, archinfo
+, bitstring
+, buildPythonPackage
+, cffi
+, fetchPypi
+, future
+, pycparser
+, pythonOlder
+}:
+
+buildPythonPackage rec {
+  pname = "pyvex";
+  version = "9.2.6";
+  format = "pyproject";
+
+  disabled = pythonOlder "3.6";
+
+  src = fetchPypi {
+    inherit pname version;
+    hash = "sha256-I2ZQJ/CDvNq5uJoLT9SHDGzeuI32YUy/6fMSNR9WM8I=";
+  };
+
+  propagatedBuildInputs = [
+    archinfo
+    bitstring
+    cffi
+    future
+    pycparser
+  ];
+
+  postPatch = lib.optionalString stdenv.isDarwin ''
+    substituteInPlace vex/Makefile-gcc \
+      --replace '/usr/bin/ar' 'ar'
+  '';
+
+  setupPyBuildFlags = lib.optionals stdenv.isLinux [
+    "--plat-name"
+    "linux"
+  ];
+
+  preBuild = ''
+    export CC=${stdenv.cc.targetPrefix}cc
+    substituteInPlace pyvex_c/Makefile \
+      --replace 'AR=ar' 'AR=${stdenv.cc.targetPrefix}ar'
+  '';
+
+  # No tests are available on PyPI, GitHub release has tests
+  # Switch to GitHub release after all angr parts are present
+  doCheck = false;
+
+  pythonImportsCheck = [
+    "pyvex"
+  ];
+
+  meta = with lib; {
+    description = "Python interface to libVEX and VEX IR";
+    homepage = "https://github.com/angr/pyvex";
+    license = with licenses; [ bsd2 gpl3Plus lgpl3Plus ];
+    maintainers = with maintainers; [ fab ];
+  };
+}