Bump PORTREVISION for master port to force all slaves rebuild
Drop PORTREVISION for exim-postgresql slave in favor of master settings
Adopt recent commits from Exim repo as numerated extra-patches till new maintenance release will be published:
19. SPF: fix result for case of only non-spf TXT RRs
20. Fix error logging for dynamically-loaded modules
21. heimdal auth: fix the increase of big_buffer size
22. Taint: hybrid checking mode
23. Fix taint hybrid-checking on BSD
24. TFO: even in binary built for modern Linux, handle error returned by old Linux kernel
25. Taint: slow-mode checking only
26. Auths: fix cyrus-sasl driver for gssapi use
27. GnuTLS: fix hanging callout connections
48f0116002