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/pkgconfig/default.nix

@@ -0,0 +1,50 @@
+{ lib
+, buildPythonPackage
+, fetchFromGitHub
+, poetry-core
+, pkg-config
+, pytestCheckHook
+}:
+
+buildPythonPackage rec {
+  pname = "pkgconfig";
+  version = "1.5.5";
+  format = "pyproject";
+
+  inherit (pkg-config)
+    setupHooks
+    wrapperName
+    suffixSalt
+    targetPrefix
+    baseBinName
+    ;
+
+  src = fetchFromGitHub {
+    owner = "matze";
+    repo = "pkgconfig";
+    rev = "v${version}";
+    sha256 = "sha256-uuLUGRNLCR3NS9g6OPCI+qG7tPWsLhI3OE5WmSI3vm8=";
+  };
+
+  postPatch = ''
+    substituteInPlace pkgconfig/pkgconfig.py \
+      --replace "pkg_config_exe = os.environ.get('PKG_CONFIG', None) or 'pkg-config'" "pkg_config_exe = '${pkg-config}/bin/${pkg-config.targetPrefix}pkg-config'"
+
+    # those pc files are missing and pkg-config validates that they exist
+    substituteInPlace data/fake-openssl.pc \
+      --replace "Requires: libssl libcrypto" ""
+  '';
+
+  nativeBuildInputs = [ poetry-core ];
+
+  checkInputs = [ pytestCheckHook ];
+
+  pythonImportsCheck = [ "pkgconfig" ];
+
+  meta = with lib; {
+    description = "Interface Python with pkg-config";
+    homepage = "https://github.com/matze/pkgconfig";
+    license = licenses.mit;
+    maintainers = with maintainers; [ SuperSandro2000 ];
+  };
+}