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/development/tools/fnlfmt/default.nix

@@ -0,0 +1,41 @@
+{ lib, stdenv, fetchFromSourcehut, fennel, lua }:
+
+stdenv.mkDerivation rec {
+  pname = "fnlfmt";
+  version = "0.2.2";
+
+  src = fetchFromSourcehut {
+    owner = "~technomancy";
+    repo = pname;
+    rev = version;
+    sha256 = "sha256-ZuSXeAhxfH0F/Y0nwqisxLMwh21Kub7viNcXD3FVYOc=";
+  };
+
+  nativeBuildInputs = [ fennel ];
+
+  buildInputs = [ lua ];
+
+  buildPhase = ''
+    runHook preBuild
+
+    echo "#!${lua}/bin/lua" > fnlfmt
+    ${fennel}/bin/fennel --require-as-include --compile cli.fnl >> fnlfmt
+    chmod +x fnlfmt
+
+    runHook postBuild
+  '';
+
+  installPhase = ''
+    runHook preInstall
+    install -D ./fnlfmt $out/bin/fnlfmt
+    runHook postInstall
+  '';
+
+  meta = with lib; {
+    description = "Formatter for Fennel";
+    homepage = "https://git.sr.ht/~technomancy/fnlfmt";
+    license = licenses.lgpl3Plus;
+    platforms = lua.meta.platforms;
+    maintainers = with maintainers; [ gpanders chiroptical ];
+  };
+}