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>

maintainers/scripts/build.nix

@@ -0,0 +1,55 @@
+{ maintainer
+, localSystem ? { system = args.system or builtins.currentSystem; }
+, system ? localSystem.system
+, crossSystem ? localSystem
+, ...
+}@args:
+
+# based on update.nix
+# nix-build build.nix --argstr maintainer <yourname>
+
+# to build for aarch64-linux using boot.binfmt.emulatedSystems:
+# nix-build build.nix --argstr maintainer <yourname> --argstr system aarch64-linux
+
+let
+  pkgs = import ./../../default.nix (removeAttrs args [ "maintainer" ]);
+  maintainer_ = pkgs.lib.maintainers.${maintainer};
+  packagesWith = cond: return: set:
+    (pkgs.lib.flatten
+      (pkgs.lib.mapAttrsToList
+        (name: pkg:
+          let
+            result = builtins.tryEval
+              (
+                if pkgs.lib.isDerivation pkg && cond name pkg then
+                  # Skip packages whose closure fails on evaluation.
+                  # This happens for pkgs like `python27Packages.djangoql`
+                  # that have disabled Python pkgs as dependencies.
+                  builtins.seq pkg.outPath
+                    [ (return name pkg) ]
+                else if pkg.recurseForDerivations or false || pkg.recurseForRelease or false
+                then packagesWith cond return pkg
+                else [ ]
+              );
+          in
+          if result.success then result.value
+          else [ ]
+        )
+        set
+      )
+    );
+in
+packagesWith
+  (name: pkg:
+    (
+      if builtins.hasAttr "meta" pkg && builtins.hasAttr "maintainers" pkg.meta
+      then (
+        if builtins.isList pkg.meta.maintainers
+        then builtins.elem maintainer_ pkg.meta.maintainers
+        else maintainer_ == pkg.meta.maintainers
+      )
+      else false
+    )
+  )
+  (name: pkg: pkg)
+  pkgs