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/deadcode/default.nix

@@ -0,0 +1,31 @@
+{ buildGoPackage
+, lib
+, fetchFromGitHub
+}:
+
+# TODO(yl): should we package https://github.com/remyoudompheng/go-misc instead of
+# the standalone extract of deadcode from it?
+buildGoPackage rec {
+  pname = "deadcode-unstable";
+  version = "2016-07-24";
+  rev = "210d2dc333e90c7e3eedf4f2242507a8e83ed4ab";
+
+  goPackagePath = "github.com/tsenart/deadcode";
+  excludedPackages = "cmd/fillswitch/test-fixtures";
+
+  src = fetchFromGitHub {
+    inherit rev;
+
+    owner = "tsenart";
+    repo = "deadcode";
+    sha256 = "05kif593f4wygnrq2fdjhn7kkcpdmgjnykcila85d0gqlb1f36g0";
+  };
+
+  meta = with lib; {
+    description = "Very simple utility which detects unused declarations in a Go package";
+    homepage = "https://github.com/remyoudompheng/go-misc/tree/master/deadcode";
+    license = licenses.bsd3;
+    maintainers = with maintainers; [ kalbasit ];
+    platforms = platforms.linux ++ platforms.darwin;
+  };
+}