el/dot-emacs.el: Hack Gnus to cope with IMAP literals properly.

el/dot-emacs.el: Hack Gnus to cope with IMAP literals properly.

The bug manifests when Dovecot encounters a MIME-part header of the form

	Content-Description:
		BLAH...

Gnus requests `BODYSTRUCTURE' as part of its `FETCH' command.  In the
specific case shown above, Dovecot encodes the description using IMAP
`literal' quoting, as

	{LEN}

		BLAH...

(The first newline is part of the literal syntax; and the second is part
of the header data.  Actually, the first newline is an IETF-style
carriage-return/line-feed pair, and the second is a bare linefeed, but
that doesn't matter here.)

Gnus has a loop which converts such strings into plain double-quoted
strings, but it can't cope with two consecutive such strings.
Specifically, it ends up with

	... " BLAH"| {LEN} ...

with point at the `|', but expects to find at least two characters
before the next `{LEN}'.  Hacky fix: move back by one place before
resuming the search.

Much worse is the need to include the entire function here so that I can
patch it just a little.