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/xgboost/default.nix

@@ -0,0 +1,67 @@
+{ lib
+, buildPythonPackage
+, pytestCheckHook
+, cmake
+, scipy
+, scikit-learn
+, stdenv
+, xgboost
+, pandas
+, matplotlib
+, graphviz
+, datatable
+, hypothesis
+}:
+
+buildPythonPackage {
+  pname = "xgboost";
+  inherit (xgboost) version src meta;
+
+  nativeBuildInputs = [ cmake ];
+  buildInputs = [ xgboost ];
+  propagatedBuildInputs = [ scipy ];
+  checkInputs = [
+    pytestCheckHook
+    scikit-learn
+    pandas
+    matplotlib
+    graphviz
+    datatable
+    hypothesis
+  ];
+
+  # Override existing logic for locating libxgboost.so which is not appropriate for Nix
+  prePatch = let
+    libPath = "${xgboost}/lib/libxgboost${stdenv.hostPlatform.extensions.sharedLibrary}";
+  in ''
+    echo 'find_lib_path = lambda: ["${libPath}"]' > python-package/xgboost/libpath.py
+  '';
+
+  dontUseCmakeConfigure = true;
+
+  postPatch = ''
+    cd python-package
+  '';
+
+  preCheck = ''
+    ln -sf ../demo .
+    ln -s ${xgboost}/bin/xgboost ../xgboost
+  '';
+
+  # tests are extremely cpu intensive, only run basic tests to ensure package is working
+  pytestFlagsArray = ["../tests/python/test_basic.py"];
+  disabledTestPaths = [
+    # Requires internet access: https://github.com/dmlc/xgboost/blob/03cd087da180b7dff21bd8ef34997bf747016025/tests/python/test_ranking.py#L81
+    "../tests/python/test_ranking.py"
+  ];
+  disabledTests = [
+    "test_cli_binary_classification"
+    "test_model_compatibility"
+  ] ++ lib.optionals stdenv.isDarwin [
+    # fails to connect to the com.apple.fonts daemon in sandboxed mode
+    "test_plotting"
+    "test_sklearn_plotting"
+  ];
+
+  __darwinAllowLocalNetworking = true;
+}