Fix for emacs 24

[David Bremner]

On Fri, 26 Aug 2011 10:47:44 -0600, richardmurri at gmail.com wrote:

> ** `compose-mail' now accepts an optional 8th arg, RETURN-ACTION, and
> passes it to the mail user agent function.  This argument specifies an
> action for returning to the caller after finishing with the mail.
> This is currently used by Rmail to delete a mail window.
> 
> 
> compose-mail is run when creating a new email.  It breaks horribly
> without a spot for the optional argument, however most mail agents don't
> use the argument at all.  By just including the extra argument, most
> everything works well with notmuch in emacs 24.

Could you rework your patch to include more or less this discussion in
the commit message?

Thanks,

David