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/compression/nx2elf/default.nix

@@ -0,0 +1,33 @@
+{ lib, stdenv, fetchFromGitHub, lz4 }:
+
+stdenv.mkDerivation rec {
+  pname = "nx2elf";
+  version = "unstable-2021-11-21";
+
+  src = fetchFromGitHub {
+    owner = "shuffle2";
+    repo = "nx2elf";
+    rev = "735aaa0648a5a6c996b48add9465db86524999f6";
+    sha256 = "sha256-cS8FFIEgDWva0j9JXhS+s7Y4Oh+mNhFaKRI7BF2hqvs=";
+  };
+
+  buildInputs = [ lz4 ];
+
+  postPatch = ''
+    # pkg-config is not supported, so we'll manually devendor lz4
+    cp ${lz4.src}/lib/lz4.{h,c} .
+  '';
+
+  installPhase = ''
+    mkdir -p $out/bin
+    install -D nx2elf $out/bin/nx2elf
+  '';
+
+  meta = with lib; {
+    homepage = "https://github.com/shuffle2/nx2elf";
+    description = "Convert Nintendo Switch executable files to ELFs";
+    license = licenses.unfree; # No license specified upstream
+    platforms = [ "x86_64-linux" ]; # Should work on Darwin as well, but this is untested. aarch64-linux fails.
+    maintainers = [ maintainers.ivar ];
+  };
+}