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/tools/misc/patchelf/0.13.nix

@@ -0,0 +1,23 @@
+{ stdenv, fetchurl, patchelf }:
+
+# Note: this package is used for bootstrapping fetchurl, and thus
+# cannot use fetchpatch! All mutable patches (generated by GitHub or
+# cgit) that are needed here should be included directly in Nixpkgs as
+# files.
+
+stdenv.mkDerivation rec {
+  pname = "patchelf";
+  version = "0.13.1";
+
+  src = fetchurl {
+    url = "https://github.com/NixOS/${pname}/releases/download/${version}/${pname}-${version}.tar.bz2";
+    sha256 = "sha256-OeiuzNdJXVTfCU0rSnwIAQ/3d3A2+q8k8o4Hd30VmOI=";
+  };
+
+  setupHook = [ ./setup-hook.sh ];
+
+  # fails 8 out of 24 tests, problems when loading libc.so.6
+  doCheck = stdenv.name == "stdenv-linux";
+
+  inherit (patchelf) meta;
+}