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/eval-release.nix

@@ -0,0 +1,24 @@
+# Evaluate `release.nix' like Hydra would.  Too bad nix-instantiate
+# can't to do this.
+
+with import ../../lib;
+
+let
+  trace = if builtins.getEnv "VERBOSE" == "1" then builtins.trace else (x: y: y);
+
+  rel = removeAttrs (import ../../pkgs/top-level/release.nix { }) [ "tarball" "unstable" "xbursttools" ];
+
+  # Add the ‘recurseForDerivations’ attribute to ensure that
+  # nix-instantiate recurses into nested attribute sets.
+  recurse = path: attrs:
+    if (builtins.tryEval attrs).success then
+      if isDerivation attrs
+      then
+        if (builtins.tryEval attrs.drvPath).success
+        then { inherit (attrs) name drvPath; }
+        else { failed = true; }
+      else { recurseForDerivations = true; } //
+           mapAttrs (n: v: let path' = path ++ [n]; in trace path' (recurse path' v)) attrs
+    else { };
+
+in recurse [] rel