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/top-level/dhall-packages.nix

@@ -0,0 +1,49 @@
+{ lib
+, newScope
+, overrides ? (self: super: {})
+}:
+
+let
+  packages = self:
+    let
+      callPackage = newScope self;
+
+      buildDhallPackage =
+        callPackage ../development/interpreters/dhall/build-dhall-package.nix { };
+
+      buildDhallGitHubPackage =
+        callPackage ../development/interpreters/dhall/build-dhall-github-package.nix { };
+
+      buildDhallDirectoryPackage =
+        callPackage ../development/interpreters/dhall/build-dhall-directory-package.nix { };
+
+      buildDhallUrl =
+        callPackage ../development/interpreters/dhall/build-dhall-url.nix { };
+
+      generateDhallDirectoryPackage =
+        callPackage ../development/interpreters/dhall/generate-dhall-directory-package.nix { };
+
+    in
+      { inherit
+          callPackage
+          buildDhallPackage
+          buildDhallGitHubPackage
+          buildDhallDirectoryPackage
+          buildDhallUrl
+          generateDhallDirectoryPackage
+        ;
+
+        lib = import ../development/dhall-modules/lib.nix { inherit lib; };
+
+        dhall-grafana =
+          callPackage ../development/dhall-modules/dhall-grafana.nix { };
+
+        dhall-kubernetes =
+          callPackage ../development/dhall-modules/dhall-kubernetes.nix { };
+
+        Prelude =
+          callPackage ../development/dhall-modules/Prelude.nix { };
+      };
+
+in
+  lib.fix' (lib.extends overrides packages)