Proposal: removeDirectoryRecursive should not follow symlinks

[Edward Z. Yang]

Discussion period: one month

I propose to backwards incompatibly change the behavior of
removeDirectoryRecursive to not follow symlinks.  We could optionally
add a replacement function under a new name which does follow symlinks.

This would bring its behavior inline with rm -rf.

I also opened a ticket here: https://ghc.haskell.org/trac/ghc/ticket/9266

Thanks,
Edward