Log Message:
Update to amavisd-new-2.11.1, upstream release notes:

- removed a trailing dot element from @INC, as a workaround for a perl
  vulnerability CVE-2016-1238;

- amavis-services: bumping up syslog level from LOG_NOTICE to LOG_ERR
  for a message "PID <pid> went away", and removed redundant newlines
  from some log messages;

- safe_decode() and safe_decode_utf8(): avoid warning messages
    "Use of uninitialized value in subroutine entry"
  in Encode::MIME::Header when the $check argument is undefined;

- @sa_userconf_maps has been extended to allow loading of per-recipient
  (or per- policy bank, or global) SpamAssassin configuration set from
  LDAP. For consistency with SQL a @sa_userconf_maps entry prefixed with
  'ldap:' will load SpamAssassin configuration set using the
  load_scoreonly_ldap() method;  a patch by Atanas Karashenski;

- add some Sanesecurity.Foxhole false positives to the default
  list @virus_name_to_spam_score_maps;

- updated some comments;

+++
also add a patch to make it run with perl 5.28 without complaints
about regex syntax