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/tensorflow-metadata/default.nix

@@ -0,0 +1,51 @@
+{ absl-py
+, buildPythonPackage
+, fetchFromGitHub
+, googleapis-common-protos
+, protobuf
+, lib
+}:
+
+buildPythonPackage rec {
+  pname = "tensorflow-metadata";
+  version = "1.8.0";
+
+  src = fetchFromGitHub {
+    owner = "tensorflow";
+    repo = "metadata";
+    rev = "refs/tags/v${version}";
+    sha256 = "sha256-IaLr6XYEy1EcyWi5GWzDFa7TeVZ59v8Wj5qkNdVbOqw=";
+  };
+
+  patches = [
+    ./build.patch
+  ];
+
+  # Default build pulls in Bazel + extra deps, given the actual build
+  # is literally three lines (see below) - replace it with custom build.
+  preBuild = ''
+    for proto in tensorflow_metadata/proto/v0/*.proto; do
+      protoc --python_out=. $proto
+    done
+  '';
+
+  propagatedBuildInputs = [
+    absl-py
+    googleapis-common-protos
+    protobuf
+  ];
+
+  # has no tests
+  doCheck = false;
+
+  pythonImportsCheck = [
+    "tensorflow_metadata"
+  ];
+
+  meta = with lib; {
+    description = "Standard representations for metadata that are useful when training machine learning models with TensorFlow";
+    homepage = "https://github.com/tensorflow/metadata";
+    license = licenses.asl20;
+    maintainers = with maintainers; [ ndl ];
+  };
+}