mail/exim: import exim-4.94+fixes branch as state of 2020.11.25
Used git diffs:
[38/42] GnuTLS: clear errno before any data i/o op, so error logging does not see stale values
[39/42] Fix non-TLS build
[40/42] eximon: fix FreeBSD build
[41/42] LDAP: fix taint-check in server list walk. Bug 2646
[42/42] Pass authenticator pubname through spool. Bug 2648
Also patch files/150.exim-tidydb to prevent its output when daily_show_success=NO. [1]
Submitted by: Dmitry Selivanov <sd@rlan.ru> via email [1]
Approved by: ports-secteam (with hat on)
a2162f9837