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/greetd/default.nix

@@ -0,0 +1,51 @@
+{ rustPlatform
+, lib
+, fetchFromSourcehut
+, pam
+, scdoc
+, installShellFiles
+}:
+
+rustPlatform.buildRustPackage rec {
+  pname = "greetd";
+  version = "0.8.0";
+
+  src = fetchFromSourcehut {
+    owner = "~kennylevinsen";
+    repo = pname;
+    rev = version;
+    sha256 = "sha256-20D6HanUeAc0S9czkNJFmhsrfEqodpafkHsmwKccrHQ=";
+  };
+
+  cargoHash = "sha256-8nMQ81Y0DnPs9WmxNASlcjTEVw5lh+nZtZ7vmmBCu2g=";
+
+  nativeBuildInputs = [
+    scdoc
+    installShellFiles
+  ];
+
+  buildInputs = [
+    pam
+  ];
+
+  postInstall = ''
+    for f in man/*; do
+      scdoc < "$f" > "$(sed 's/-\([0-9]\)\.scd$/.\1/' <<< "$f")"
+      rm "$f"
+    done
+    installManPage man/*
+  '';
+
+  meta = with lib; {
+    description = "Minimal and flexible login manager daemon";
+    longDescription = ''
+      greetd is a minimal and flexible login manager daemon
+      that makes no assumptions about what you want to launch.
+      Comes with agreety, a simple, text-based greeter.
+    '';
+    homepage = "https://sr.ht/~kennylevinsen/greetd/";
+    license = licenses.gpl3Plus;
+    maintainers = with maintainers; [ luc65r ];
+    platforms = platforms.linux;
+  };
+}