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/cbor-diag/Gemfile.lock

@@ -0,0 +1,21 @@
+GEM
+  remote: https://rubygems.org/
+  specs:
+    cbor-diag (0.5.6)
+      json
+      neatjson
+      treetop (~> 1)
+    json (2.2.0)
+    neatjson (0.9)
+    polyglot (0.3.5)
+    treetop (1.6.10)
+      polyglot (~> 0.3)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  cbor-diag
+
+BUNDLED WITH
+   2.1.4