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/os-specific/linux/undervolt/default.nix

@@ -0,0 +1,27 @@
+{ lib, fetchFromGitHub, python3Packages }:
+
+python3Packages.buildPythonApplication rec {
+  version = "0.3.0";
+  pname = "undervolt";
+
+  src = fetchFromGitHub {
+    owner = "georgewhewell";
+    repo = "undervolt";
+    rev = version;
+    sha256 = "1aybk8vbb4745raz7rvpkk6b98xrdiwjhkpbv3kwsgsr9sj42lp0";
+  };
+
+  meta = with lib; {
+    homepage = "https://github.com/georgewhewell/undervolt/";
+    description = "A program for undervolting Intel CPUs on Linux";
+
+    longDescription = ''
+      Undervolt is a program for undervolting Intel CPUs under Linux. It works in a similar
+      manner to the Windows program ThrottleStop (i.e, MSR 0x150). You can apply a fixed
+      voltage offset to one of 5 voltage planes, and override your systems temperature
+      target (CPU will throttle when this temperature is reached).
+    '';
+    license = licenses.gpl2;
+    platforms = [ "x86_64-linux" ];
+  };
+}