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/r-modules/test-evaluation.nix

@@ -0,0 +1,21 @@
+# Run
+#
+#   nix-build test-evaluation.nix --dry-run
+#
+# to test whether the R package set evaluates properly.
+
+let
+
+  config = {
+    allowBroken = true;
+    allowUnfree = true;
+  };
+
+  inherit (import ../../.. { inherit config; }) pkgs;
+
+  rWrapper = pkgs.rWrapper.override {
+    packages = pkgs.lib.filter pkgs.lib.isDerivation (pkgs.lib.attrValues pkgs.rPackages);
+  };
+
+in
+  rWrapper