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/one_gadget/Gemfile

@@ -0,0 +1,2 @@
+source 'https://rubygems.org'
+gem 'one_gadget'

pkgs/development/tools/misc/one_gadget/Gemfile.lock

@@ -0,0 +1,17 @@
+GEM
+  remote: https://rubygems.org/
+  specs:
+    bindata (2.4.4)
+    elftools (1.1.0)
+      bindata (~> 2)
+    one_gadget (1.7.2)
+      elftools (>= 1.0.2, < 1.2.0)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  one_gadget
+
+BUNDLED WITH
+   2.1.4

pkgs/development/tools/misc/one_gadget/default.nix

@@ -0,0 +1,17 @@
+{ lib, bundlerApp, bundlerUpdateScript }:
+
+bundlerApp {
+  pname = "one_gadget";
+  gemdir = ./.;
+  exes = [ "one_gadget" ];
+
+  passthru.updateScript = bundlerUpdateScript "one_gadget";
+
+  meta = with lib; {
+    description = "The best tool for finding one gadget RCE in libc.so.6";
+    homepage    = "https://github.com/david942j/one_gadget";
+    license     = licenses.mit;
+    maintainers = with maintainers; [ artemist nicknovitski ];
+    platforms   = platforms.unix;
+  };
+}

pkgs/development/tools/misc/one_gadget/gemset.nix

@@ -0,0 +1,34 @@
+{
+  bindata = {
+    groups = ["default"];
+    platforms = [];
+    source = {
+      remotes = ["https://rubygems.org"];
+      sha256 = "0kz42nvxnk1j9cj0i8lcnhprcgdqsqska92g6l19ziadydfk2gqy";
+      type = "gem";
+    };
+    version = "2.4.4";
+  };
+  elftools = {
+    dependencies = ["bindata"];
+    groups = ["default"];
+    platforms = [];
+    source = {
+      remotes = ["https://rubygems.org"];
+      sha256 = "0kdf0ck4rzxpd006y09rfwppdrqb3sxww4gzfpv2053yq4mkimbn";
+      type = "gem";
+    };
+    version = "1.1.0";
+  };
+  one_gadget = {
+    dependencies = ["elftools"];
+    groups = ["default"];
+    platforms = [];
+    source = {
+      remotes = ["https://rubygems.org"];
+      sha256 = "07s2nigjw1yik895gliz3a7ps0m9j5nccq82zwdd30sv740jmf5b";
+      type = "gem";
+    };
+    version = "1.7.2";
+  };
+}