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/misc/riemann-tools/Gemfile.lock

@@ -0,0 +1,25 @@
+GEM
+  remote: https://rubygems.org/
+  specs:
+    beefcake (1.0.0)
+    json (1.8.6)
+    mtrc (0.0.4)
+    optimist (3.0.0)
+    riemann-client (0.2.6)
+      beefcake (>= 0.3.5, <= 1.0.0)
+      mtrc (>= 0.0.4)
+      trollop (>= 1.16.2)
+    riemann-tools (0.2.14)
+      json (~> 1.8)
+      optimist (~> 3.0, >= 3.0.0)
+      riemann-client (~> 0.2, >= 0.2.6)
+    trollop (2.9.9)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  riemann-tools
+
+BUNDLED WITH
+   2.1.4