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/interpreters/dhall/build-dhall-github-package.nix

@@ -0,0 +1,62 @@
+{ buildDhallPackage, fetchFromGitHub, lib }:
+
+# This function is used by `dhall-to-nixpkgs` when given a GitHub repository
+lib.makePackageOverridable
+  ( { # Arguments passed through to `buildDhallPackage`
+      name
+    , dependencies ? []
+    , source ? false
+
+    , # The directory containing the Dhall files, if other than the root of the
+      # repository
+      directory ? ""
+    , # The file to import, relative to the above directory
+      file ? "package.dhall"
+      # Set to `true` to generate documentation for the package
+    , document ? false
+
+      # Arguments passed through to `fetchFromGitHub`
+    , owner
+    , repo
+    , rev
+      # Extra arguments passed through to `fetchFromGitHub`, such as the hash
+      # or `fetchSubmodules`
+    , ...
+    }@args:
+
+    let
+      versionedName = "${name}-${rev}";
+
+      src = fetchFromGitHub ({
+        name = "${versionedName}-source";
+
+        inherit owner repo rev;
+      } // removeAttrs args [
+        "name"
+        "dependencies"
+        "document"
+        "source"
+        "directory"
+        "file"
+        "owner"
+        "repo"
+        "rev"
+      ]);
+
+      prefix = lib.optionalString (directory != "") "/${directory}";
+
+    in
+      buildDhallPackage
+        ( { inherit dependencies source;
+
+            name = versionedName;
+
+            code = "${src}${prefix}/${file}";
+          }
+        // lib.optionalAttrs document
+          { documentationRoot = "${src}/${prefix}";
+
+            baseImportUrl = "https://raw.githubusercontent.com/${owner}/${repo}/${rev}${prefix}";
+          }
+        )
+  )