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/usbrelay/default.nix

@@ -0,0 +1,37 @@
+{ stdenv, lib, fetchFromGitHub, hidapi, installShellFiles }:
+stdenv.mkDerivation rec {
+  pname = "usbrelay";
+  version = "1.0";
+
+  src = fetchFromGitHub {
+    owner = "darrylb123";
+    repo = "usbrelay";
+    rev = version;
+    sha256 = "sha256-5zgpN4a+r0tmw0ISTJM+d9mo+L/qwUvpWPSsykuG0cg=";
+  };
+
+  nativeBuildInputs = [
+    installShellFiles
+  ];
+
+  buildInputs = [
+    hidapi
+  ];
+
+  makeFlags = [
+    "DIR_VERSION=${version}"
+    "PREFIX=${placeholder "out"}"
+  ];
+
+  postInstall = ''
+    installManPage usbrelay.1
+  '';
+
+  meta = with lib; {
+    description = "Tool to control USB HID relays";
+    homepage = "https://github.com/darrylb123/usbrelay";
+    license = licenses.gpl2Plus;
+    maintainers = with maintainers; [ wentasah ];
+    platforms = platforms.linux;
+  };
+}