Fix export of release 'archive-url'

I don't pretend to know anything about Lisp—I've literally never written a line of Lisp prior to this—but I'm pretty sure this is supposed to export the `archive-url` symbol in release and not the non-existent `archive-url-suffix`.

I checked the Git history, but it's been like this since the initial commit. Let me know if I'm totally off-base and I'll, like, read a Lisp tutorial or something before I bother you again.