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/fluentd/Gemfile

@@ -0,0 +1,12 @@
+source "https://rubygems.org"
+
+gem 'fluentd'
+gem 'fluent-plugin-record-reformer'
+gem 'fluent-plugin-s3'
+gem 'fluent-plugin-kinesis'
+gem 'fluent-plugin-kafka'
+gem 'fluent-plugin-elasticsearch'
+gem 'fluent-plugin-mongo'
+gem 'fluent-plugin-webhdfs'
+gem 'fluent-plugin-rewrite-tag-filter'
+gem 'fluent-plugin-cloudwatch-logs'