postfix: Update to version 3.9.1

postfix: Update to version 3.9.1

- Update from version 3.9.0 to 3.9.1
- Update of rootfile not required
- Changelog
    3.9.1
	    The mail_version configuration parameter did not have a three-number value
	     (3.9 instead of 3.9.0; it still had the two-number version from the
	     development releases postfix-3.9-yyyymmdd). This broke pathnames derived
	     from the mail_version value, such as shlib_directory. Problem reported by
	     Michael Orlitzky.
	    Bugfix (defect introduced: Postfix 2.9, date 20111218): with
	     "smtpd_sasl_auth_enable = no", the permit_sasl_authenticated feature
	     ignored information that was received with the XCLIENT LOGIN command, so
	     that the client was treated as unauthenticated. This was fixed by removing
	     an unnecessary test. Problem reported by Antonin Verrier.
	    Bugfix (defect introduced: postfix 3.0): the default master.cf syslog_name
	     setting for the relay service did not preserve multi-instance information,
	     which complicated logfile analysis. Found during a support discussion.
	    Bugfix (defect introduced: Postfix 2.3, date 20051222): file descriptor
	     leak after failure to connect to a Dovecot auth server. The impact is
	     limited because Dovecot auth failures are rare, there are limits on the
	     number of retries (one), on the number of errors per SMTP session
	     (smtpd_hard_error_limit), on the number of sessions per SMTP server
	     process (max_use), and on the number of file handles per process (managed
	     with sysctl). Found during code maintenance.
	    Bugfix (defect introduced: Postfix 3.4, date 20190121): the postsuper
	     command failed with "open logfile '/path/to/file': Permission denied" when
	     the maillog_file parameter specified a filename and Postfix was not
	     running. This was fixed by opening the maillog_file before dropping root
	     privileges. Found during code maintenance.
	    Bugfix (defect introduced Postfix 3.0). No autodetection of UTF8 text when
	     missing message headers were automatically added by Postfix (for example,
	     a From: header with UTF8 full name information from the password file).
	     This caused Postfix to send UTF8 in message headers without using the
	     SMTPUTF8 protocol. Problem reported by Michael Tokarev.

Signed-off-by: Adolf Belka <adolf.belka@ipfire.org>
Signed-off-by: Arne Fitzenreiter <arne_f@ipfire.org>