Gnutls change broke Gnus

[Teemu Likonen]

Recent change in emacs-24 branch and gnutls.c file broke Gnus. After I
have started it (M-x gnus) I get error when my system tries an IMAP
connect to my mail server.

    Opening nnimap server on sonera...failed: ; Unable to open server
    nnimap+sonera due to: GnuTLS error: #<process *nnimap*>,
    gnutls-e-again

The server in question is configured in gnus-secondary-select-methods
and has option (nnimap-stream ssl). The error appeared after this
commit:

    commit 4d92aff95ffcdc34cc08d9a5fb1b16263b97f4d8
    Author: Andreas Schwab <address@hidden>
    Date:   2012-06-26 11:39:52 +0200

        * gnutls.c (emacs_gnutls_handshake): Only retry if
        GNUTLS_E_INTERRUPTED.

If I compile and use Emacs just from the parent of that commit Gnus
works nicely again.