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/build-support/nuke-references/default.nix

@@ -0,0 +1,39 @@
+# The program `nuke-refs' created by this derivation replaces all
+# references to the Nix store in the specified files by a non-existant
+# path (/nix/store/eeee...).  This is useful for getting rid of
+# dependencies that you know are not actually needed at runtime.
+
+{ lib, stdenvNoCC, perl, signingUtils, shell ? stdenvNoCC.shell }:
+
+let
+  stdenv = stdenvNoCC;
+
+  darwinCodeSign = stdenv.targetPlatform.isDarwin && stdenv.targetPlatform.isAarch64;
+in
+
+stdenvNoCC.mkDerivation {
+  name = "nuke-references";
+
+  strictDeps = true;
+  enableParallelBuilding = true;
+  dontUnpack = true;
+  dontConfigure = true;
+  dontBuild = true;
+
+  installPhase = ''
+    mkdir -p $out/bin
+    substituteAll ${./nuke-refs.sh} $out/bin/nuke-refs
+    chmod a+x $out/bin/nuke-refs
+  '';
+
+  postFixup = lib.optionalString darwinCodeSign ''
+    mkdir -p $out/nix-support
+    substituteAll ${./darwin-sign-fixup.sh} $out/nix-support/setup-hooks.sh
+  '';
+
+  # FIXME: get rid of perl dependency.
+  inherit perl;
+  inherit (builtins) storeDir;
+  shell = lib.getBin shell + (shell.shellPath or "");
+  signingUtils = if darwinCodeSign then signingUtils else null;
+}