RequireRelativeToLib cop shouldn't flag offenses from lib into lib

[utkarsh2102]

Upon using the cop on autoprefixer-rails' codebase, here's what it shows:

➜  autoprefixer-rails git:(use-rubocop) ✗ rubocop --only Packaging
Inspecting 25 files
..CC....................C

Offenses:

autoprefixer-rails.gemspec:13:24: C: Packaging/GemspecGit: Avoid using git to produce lists of files.
Downstreams often need to build your package in an environment that does not have git (on purpose).
Use some pure Ruby alternative, like Dir or Dir.glob.
  s.files            = `git ls-files`.split("\n")
                       ^^^^^^^^^^^^^^
lib/autoprefixer-rails.rb:39:1: C: Packaging/RelativeRequireToLib: Avoid using require_relative with
relative path to lib. Use require instead.
require_relative "autoprefixer-rails/result"
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
lib/autoprefixer-rails.rb:40:1: C: Packaging/RelativeRequireToLib: Avoid using require_relative with
relative path to lib. Use require instead.
require_relative "autoprefixer-rails/version"
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
lib/autoprefixer-rails.rb:41:1: C: Packaging/RelativeRequireToLib: Avoid using require_relative with
relative path to lib. Use require instead.
require_relative "autoprefixer-rails/processor"
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
lib/autoprefixer-rails.rb:43:1: C: Packaging/RelativeRequireToLib: Avoid using require_relative with
relative path to lib. Use require instead.
require_relative "autoprefixer-rails/railtie" if defined?(Rails)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
spec/spec_helper.rb:6:1: C: Packaging/RelativeRequireToLib: Avoid using require_relative with
relative path to lib. Use require instead.
require_relative "../lib/autoprefixer-rails"
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

25 files inspected, 6 offenses detected

The first and last offenses are correct. However, the middle ones don't look right.
The cop, essentially, shouldn't flag offenses from lib to lib. Just the ones that map from outside to lib.