recentf: "Select coding system" on quit

[David Reitter]

The recentf library asks the user "Select coding system" upon quitting 
emacs what coding system to use when one of the recent files is one 
with non-ascii characters, instead of non-interactively (i.e. 
automatically) choosing a safe coding system such as utf-8.

This is generated by mule-cmds.el, probably 
select-safe-coding-system-interactively or something like that.

It looks like the problem is that recentf doesn't force a safe coding 
system - however, I'm not quite sure about this, and I haven't found a 
way to force a coding system, so I'm submitting this as a bug for more 
knowledgeable people!

This is produced on current CVS build on OS X.

-- David