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/test/make-binary-wrapper/cross.nix

@@ -0,0 +1,23 @@
+{ stdenv
+, runCommand
+, makeBinaryWrapper
+, binutils
+, expectedArch ? stdenv.hostPlatform.parsed.cpu.name
+}:
+
+runCommand "make-binary-wrapper-test-cross" {
+  nativeBuildInputs = [
+    makeBinaryWrapper
+    binutils
+  ];
+  inherit expectedArch;
+} ''
+  touch prog
+  chmod +x prog
+  makeWrapper prog $out
+  read -r _ arch < <($READELF --file-header $out | grep Machine:)
+  if [[ ''${arch,,} != *"''${expectedArch,,}"* ]]; then
+    echo "expected $expectedArch, got $arch"
+    exit 1
+  fi
+''