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/chiavdf/default.nix

@@ -0,0 +1,54 @@
+{ lib
+, stdenv
+, buildPythonPackage
+, fetchPypi
+, setuptools-scm
+, substituteAll
+, cmake
+, boost
+, gmp
+, pybind11
+, pytestCheckHook
+, pythonOlder
+}:
+
+buildPythonPackage rec {
+  pname = "chiavdf";
+  version = "1.0.7";
+  disabled = pythonOlder "3.7";
+
+  src = fetchPypi {
+    inherit pname version;
+    hash = "sha256-956517eGqRSLg+Y4ybmASiZoypgpYn/D9lbPA4Rcfts=";
+  };
+
+  patches = [
+    # prevent CMake from trying to get libraries on the Internet
+    (substituteAll {
+      src = ./dont_fetch_dependencies.patch;
+      pybind11_src = pybind11.src;
+    })
+  ];
+
+  # x86 instructions are needed for this component
+  BUILD_VDF_CLIENT = lib.optionalString (!stdenv.isx86_64) "N";
+
+  nativeBuildInputs = [ cmake setuptools-scm ];
+
+  buildInputs = [ boost gmp pybind11 ];
+
+  checkInputs = [
+    pytestCheckHook
+  ];
+
+  # CMake needs to be run by setuptools rather than by its hook
+  dontConfigure = true;
+
+  meta = with lib; {
+    broken = stdenv.isDarwin;
+    description = "Chia verifiable delay function utilities";
+    homepage = "https://www.chia.net/";
+    license = licenses.asl20;
+    maintainers = teams.chia.members;
+  };
+}