bug#20429: 25.0.50; RMAIL useless

[Eli Zaretskii]

> Date: Sun, 26 Apr 2015 17:11:20 +0100
> From: jpff <jpff@codemist.co.uk>
> 
> After the o command failed in RMAIL mode I did a complete "make
> bootstrap" and now it is worse.  I cannot even start using rmail
> Typical failure is
> Debugger entered--Lisp error: (wrong-number-of-arguments point 1)
>   point(2)
>   rmail-ensure-blank-line()
>   rmail-output-as-mbox("/home/jpff/MAIL/spam2015" nil)
>   rmail-output("/home/jpff/MAIL/spam2015" 1)
>   rmail-summary-output("/home/jpff/MAIL/spam2015" 1)
>   funcall-interactively(rmail-summary-output "/home/jpff/MAIL/spam2015" 1)
>   call-interactively(rmail-summary-output nil nil)
>   command-execute(rmail-summary-output)

Can you send a minimal mbox file that triggers this?  (You can convert
all characters to "x" if you don't want to show the actual contents.)