Update dovecot to 2.2.35, and bump pigeonhole

• charset_alias: compile fails with Solaris Studio, reported by John Woods.
• Fix local name handling in v2.2.34 SNI code, bug found by cPanel.
• imapc: Don't try to add mails to index if they already exist there.
• imapc: If email is modified in istream_opened hook, mail size isn't updated.
• lib-dcrypt: When reading encrypted data, more data would not be read if buffer was not consumed causing panic or hang.
• notify: When notify plugin is used and transaction commit fails in dsync, crash occurs.
• sdbox: When delivering to a mailbox that is over quota, temp files are not cleaned up when saving or copying fails.