Revert previous fix due to upstream bundler bug

[scotthain]

Description

Looks like we're hitting: rubygems/bundler#4467

Manifests itself as follows:

bundle install --without development development_extras rbx
Fetching gem metadata from https://rubygems.org/........
Fetching version metadata from https://rubygems.org/..
Fetching dependency metadata from https://rubygems.org/.
Resolving dependencies...
Using libyajl2 1.2.0
Your Gemfile.lock is corrupt. The following gem is missing from the DEPENDENCIES section: 'ffi'

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/cc @chef/omnibus-maintainers <- This ensures the Omnibus Maintainers team are notified to review this PR.

@chef/engineering-services

[scotthain]

I have not been able to get an isolated test case for debugging, will work on that after the current issues are resolved.

EDIT: looks like Lamont did - thanks!!

[lamont-granquist]

👍

[yzl]

👍