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/btrfs/default.nix

@@ -0,0 +1,26 @@
+{ lib
+, buildPythonPackage
+, fetchPypi
+}:
+
+buildPythonPackage rec {
+  pname = "btrfs";
+  version = "13";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "sha256-NSyzhpHYDkunuU104XnbVCcVRNDoVBz4KuJRrE7WMO0=";
+  };
+
+  # no tests (in v12)
+  doCheck = false;
+  pythonImportsCheck = [ "btrfs" ];
+
+  meta = with lib; {
+    description = "Inspect btrfs filesystems";
+    homepage = "https://github.com/knorrie/python-btrfs";
+    license = licenses.lgpl3Plus;
+    platforms = platforms.linux;
+    maintainers = with maintainers; [ evils Luflosi ];
+  };
+}