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/applications/misc/hello-unfree/default.nix

@@ -0,0 +1,23 @@
+{ lib, stdenv, runtimeShell }:
+
+stdenv.mkDerivation {
+  pname = "example-unfree-package";
+  version = "1.0";
+
+  dontUnpack = true;
+
+  installPhase = ''
+    mkdir -p $out/bin
+    cat > $out/bin/hello-unfree << EOF
+    #!${runtimeShell}
+    echo "Hello, you are running an unfree system!"
+    EOF
+    chmod +x $out/bin/hello-unfree
+  '';
+
+  meta = {
+    description = "An example package with unfree license (for testing)";
+    license = lib.licenses.unfree;
+    maintainers = [ lib.maintainers.oxij ];
+  };
+}