[RFC][PATCH] krb5 => libverto main loop

[Sam Hartman]

libevent tries to be reasonably portable. It works on Windows, OSX, and
all of the Debian platforms (including both kfreebsd and hurd). For
something like vxworks, I'd expect you to want to supply your own event
loop anyway.

As I said in previous mail, I don't mind requiring external dependencies
that are not present on an OS. I am quite uncomfortable requiring a
newer version of a dependency that is already present. I think there are
things we could do: bundle a libevent and use ours unless
--with-system-libevent is specified. (Or probably call it
--with-system-eventlibary, because it would allow you to choose whatever
you liked.)