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/gcadapter-oc-kmod/default.nix

@@ -0,0 +1,38 @@
+{ lib, stdenv
+, fetchFromGitHub
+, kernel
+, kmod
+}:
+
+let
+  kerneldir = "lib/modules/${kernel.modDirVersion}";
+in stdenv.mkDerivation rec {
+  pname = "gcadapter-oc-kmod";
+  version = "unstable-2021-12-11";
+
+  src = fetchFromGitHub {
+    owner = "HannesMann";
+    repo = pname;
+    rev = "d4ddf15deb74c51dbdfc814d481ef127c371f444";
+    sha256 = "sha256-bHA1611rcO8/d48b1CHsiurEt3/n+5WErtHXAU7Eh1o=";
+  };
+
+  nativeBuildInputs = kernel.moduleBuildDependencies;
+
+  makeFlags = kernel.makeFlags ++ [
+    "KERNEL_SOURCE_DIR=${kernel.dev}/${kerneldir}/build"
+    "INSTALL_MOD_PATH=$(out)"
+  ];
+
+  installPhase = ''
+    install -D {,$out/${kerneldir}/extra/}gcadapter_oc.ko
+  '';
+
+  meta = with lib; {
+    description = "Kernel module for overclocking the Nintendo Wii U/Mayflash GameCube adapter";
+    homepage = "https://github.com/HannesMann/gcadapter-oc-kmod";
+    license = licenses.gpl2;
+    maintainers = with maintainers; [ r-burns ];
+    platforms = platforms.linux;
+  };
+}