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/fx2/default.nix

@@ -0,0 +1,45 @@
+{ lib
+, buildPythonPackage
+, python
+, fetchFromGitHub
+, sdcc
+, libusb1
+, crcmod
+}:
+
+buildPythonPackage rec {
+  pname = "fx2";
+  version = "0.9";
+
+  src = fetchFromGitHub {
+    owner = "whitequark";
+    repo = "libfx2";
+    rev = "v${version}";
+    sha256 = "sha256-Uk+K7ym92JX4fC3PyTNxd0UvBzoNZmtbscBYjSWChuk=";
+  };
+
+  nativeBuildInputs = [ sdcc ];
+
+  propagatedBuildInputs = [ libusb1 crcmod ];
+
+  preBuild = ''
+    cd software
+    ${python.pythonForBuild.interpreter} setup.py build_ext
+  '';
+
+  preInstall = ''
+    mkdir -p $out/share/libfx2
+    cp -R ../firmware/library/{.stamp,lib,include,fx2{rules,conf}.mk} \
+      $out/share/libfx2
+  '';
+
+  # installCheckPhase tries to run build_ext again and there are no tests
+  doCheck = false;
+
+  meta = with lib; {
+    description = "Chip support package for Cypress EZ-USB FX2 series microcontrollers";
+    homepage = "https://github.com/whitequark/libfx2";
+    license = licenses.bsd0;
+    maintainers = with maintainers; [ emily ];
+  };
+}