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/servers/web-apps/discourse/plugin_gem_api_version.patch

@@ -0,0 +1,13 @@
+diff --git a/lib/plugin_gem.rb b/lib/plugin_gem.rb
+index 49882b2cd9..96672df2ea 100644
+--- a/lib/plugin_gem.rb
++++ b/lib/plugin_gem.rb
+@@ -4,7 +4,7 @@ module PluginGem
+   def self.load(path, name, version, opts = nil)
+     opts ||= {}
+ 
+-    gems_path = File.dirname(path) + "/gems/#{RUBY_VERSION}"
++    gems_path = File.dirname(path) + "/gems/#{Gem.ruby_api_version}"
+ 
+     spec_path = gems_path + "/specifications"
+