Don't use internal last_cur_mtime stamp - it's index-specific so always get it from index's header.
Don't use internal last_cur_mtime stamp - it's index-specific so always get
it from index's header.

--HG--
branch : HEAD

jkerihuel/dovecot,jwm/dovecot-notmuch,dscho/dovecot,jwm/dovecot-notmuch,jkerihuel/dovecot,jwm/dovecot-notmuch,jwm/dovecot-notmuch,jkerihuel/dovecot,jkerihuel/dovecot,dscho/dovecot,dscho/dovecot,dscho/dovecot,dscho/dovecot,jkerihuel/dovecot,jwm/dovecot-notmuch