Pass require path to sub-process when running `bundle install` (#7618)
Pass require path to sub-process when running `bundle install` (#7618)

Merge pull request 7618
ryanshaw/jekyll,fulldecent/jekyll,jaybe-jekyll/jekyll,yhironaka/yhironaka.github.io,fulldecent/jekyll,jekyll/jekyll,chrisfinazzo/jekyll,chrisfinazzo/jekyll,jaybe-jekyll/jekyll,jekyll/jekyll,jaybe-jekyll/jekyll,fulldecent/jekyll,x-way/jekyll,fulldecent/jekyll,ryanshaw/jekyll,jaybe-jekyll/jekyll,chrisfinazzo/jekyll,ryanshaw/jekyll,jekyll/jekyll,x-way/jekyll,chrisfinazzo/jekyll,x-way/jekyll,ryanshaw/jekyll,x-way/jekyll,jekyll/jekyll