bundler: Fix QA new Error

ERROR: QA Issue: bundler: Files/directories were installed but not shipped
  /usr/lib/ruby/gems/2.2.0/build_info
  /usr/lib/ruby/gems/2.2.0/extensions [installed-vs-shipped]

Signed-off-by: Armin Kuster <akuster808@gmail.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>