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/eth-hash/default.nix

@@ -0,0 +1,43 @@
+{ lib
+, fetchFromGitHub
+, buildPythonPackage
+, pythonOlder
+, pytest
+, pysha3
+, pycryptodome
+}:
+
+buildPythonPackage rec {
+  pname = "eth-hash";
+  version = "0.3.2";
+  disabled = pythonOlder "3.5";
+
+  src = fetchFromGitHub {
+    owner = "ethereum";
+    repo = "eth-hash";
+    rev = "v${version}";
+    sha256 = "sha256-LMDtFUrsPYgj/Fl9aBW1todlj1D3LlFxAkzNFAzCGLQ=";
+  };
+
+  checkInputs = [
+    pytest
+  ] ++ passthru.optional-dependencies.pycryptodome
+  ++ passthru.optional-dependencies.pysha3;
+
+  checkPhase = ''
+    pytest tests/backends/pycryptodome/
+    pytest tests/backends/pysha3/
+  '';
+
+  passthru.optional-dependencies = {
+    pycryptodome = [ pycryptodome ];
+    pysha3 = [ pysha3 ];
+  };
+
+  meta = with lib; {
+    description = "The Ethereum hashing function keccak256";
+    homepage = "https://github.com/ethereum/eth-hash";
+    license = licenses.mit;
+    maintainers = with maintainers; [ SuperSandro2000 ];
+  };
+}