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/i2c-tools/default.nix

@@ -0,0 +1,21 @@
+{ lib
+, buildPythonPackage
+, i2c-tools
+}:
+
+buildPythonPackage rec {
+  inherit (i2c-tools) pname version src;
+
+  buildInputs = [ i2c-tools ];
+
+  preConfigure = "cd py-smbus";
+
+  meta = with lib; {
+    inherit (i2c-tools.meta) homepage platforms;
+
+    description = "wrapper for i2c-tools' smbus stuff";
+    # from py-smbus/smbusmodule.c
+    license = [ licenses.gpl2Only ];
+    maintainers = [ maintainers.evils ];
+  };
+}