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/tools/misc/oppai-ng/default.nix

@@ -0,0 +1,35 @@
+{ lib, stdenv
+, fetchFromGitHub
+}:
+
+stdenv.mkDerivation rec {
+  pname = "oppai-ng";
+  version = "4.1.0";
+
+  src = fetchFromGitHub {
+    owner = "Francesco149";
+    repo = pname;
+    rev = version;
+    sha256 = "sha256-L9eraLOWm1tMImS8bLB9T4Md4VdTSxqI9Bt4r8eqxqs=";
+  };
+
+  buildPhase = ''
+    ./build
+    ./libbuild
+  '';
+
+  installPhase = ''
+    install -D oppai $out/bin/oppai
+    install -D oppai.c $out/include/oppai.c
+    install -D liboppai.so $out/lib/liboppai.so
+  '';
+
+  meta = with lib; {
+    description = "Difficulty and pp calculator for osu!";
+    homepage = "https://github.com/Francesco149/oppai-ng";
+    license = licenses.unlicense;
+    maintainers = with maintainers; [ tadeokondrak ];
+    mainProgram = "oppai";
+    platforms = platforms.all;
+  };
+}