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/astropy-extension-helpers/default.nix

@@ -0,0 +1,53 @@
+{ lib
+, buildPythonPackage
+, fetchPypi
+, findutils
+, pytestCheckHook
+, pythonOlder
+, setuptools-scm
+}:
+
+buildPythonPackage rec {
+  pname = "extension-helpers";
+  version = "1.0.0";
+  format = "pyproject";
+
+  disabled = pythonOlder "3.6";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "ca1bfac67c79cf4a7a0c09286ce2a24eec31bf17715818d0726318dd0e5050e6";
+  };
+
+  nativeBuildInputs = [
+    setuptools-scm
+  ];
+
+  patches = [ ./permissions.patch ];
+
+  checkInputs = [
+    findutils
+    pytestCheckHook
+  ];
+
+  # avoid import mismatch errors, as conftest.py is copied to build dir
+  pytestFlagsArray = [
+    "extension_helpers"
+  ];
+
+  disabledTests = [
+    # https://github.com/astropy/extension-helpers/issues/43
+    "test_write_if_different"
+  ];
+
+  pythonImportsCheck = [
+    "extension_helpers"
+  ];
+
+  meta = with lib; {
+    description = "Utilities for building and installing packages in the Astropy ecosystem";
+    homepage = "https://github.com/astropy/extension-helpers";
+    license = licenses.bsd3;
+    maintainers = with maintainers; [ rmcgibbo ];
+  };
+}

pkgs/development/python-modules/astropy-extension-helpers/permissions.patch

@@ -0,0 +1,20 @@
+diff --git a/extension_helpers/_setup_helpers.py b/extension_helpers/_setup_helpers.py
+index ec3e547..e2419f7 100644
+--- a/extension_helpers/_setup_helpers.py
++++ b/extension_helpers/_setup_helpers.py
+@@ -79,8 +79,13 @@ def get_extensions(srcdir='.'):
+     if len(ext_modules) > 0:
+         main_package_dir = min(packages, key=len)
+         src_path = os.path.join(os.path.dirname(__file__), 'src')
+-        shutil.copy(os.path.join(src_path, 'compiler.c'),
+-                    os.path.join(srcdir, main_package_dir, '_compiler.c'))
++        a = os.path.join(src_path, 'compiler.c')
++        b = os.path.join(srcdir, main_package_dir, '_compiler.c')
++        try:
++            os.unlink(b)
++        except OSError:
++            pass
++        shutil.copy(a, b)
+         ext = Extension(main_package_dir + '.compiler_version',
+                         [os.path.join(main_package_dir, '_compiler.c')])
+         ext_modules.append(ext)