Account for `sudo` wiping env vars in .vimrc
Account for `sudo` wiping env vars in .vimrc

Because running a command under `sudo` will generally wipe out variables
including $RCDIR, we've got to be prepared to find the rcfiles
ourselves. Unfortunately, that means duplicating some work that's
normally done in a different script, but this is, at least, mostly
effective.

sycobuny/rcfiles,sycobuny/rcfiles