Don't read symlinks in site.include in safe mode (#7711)
Don't read symlinks in site.include in safe mode (#7711)

Merge pull request 7711
jekyll/jekyll,chrisfinazzo/jekyll,Strangehill/jekyll,ryanshaw/jekyll,fulldecent/jekyll,jekyll/jekyll,x-way/jekyll,jaybe-jekyll/jekyll,jaybe-jekyll/jekyll,x-way/jekyll,chrisfinazzo/jekyll,x-way/jekyll,ryanshaw/jekyll,Strangehill/jekyll,Strangehill/jekyll,jekyll/jekyll,x-way/jekyll,fulldecent/jekyll,ryanshaw/jekyll,ryanshaw/jekyll,fulldecent/jekyll,Strangehill/jekyll,Strangehill/jekyll,tillgrallert/jekyll,jaybe-jekyll/jekyll,tillgrallert/jekyll,jekyll/jekyll,jaybe-jekyll/jekyll,tillgrallert/jekyll,chrisfinazzo/jekyll,fulldecent/jekyll,tillgrallert/jekyll,chrisfinazzo/jekyll,yhironaka/yhironaka.github.io,tillgrallert/jekyll