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/tools/system/procodile/gemset.nix

@@ -0,0 +1,23 @@
+{
+  json = {
+    groups = ["default"];
+    platforms = [];
+    source = {
+      remotes = ["https://rubygems.org"];
+      sha256 = "0sx97bm9by389rbzv8r1f43h06xcz8vwi3h5jv074gvparql7lcx";
+      type = "gem";
+    };
+    version = "2.2.0";
+  };
+  procodile = {
+    dependencies = ["json"];
+    groups = ["default"];
+    platforms = [];
+    source = {
+      remotes = ["https://rubygems.org"];
+      sha256 = "025pbr1kah7cgs527n5q56m5agaa2smzac4rpmpk619xg4r1rdhs";
+      type = "gem";
+    };
+    version = "1.0.23";
+  };
+}