• Update the maildir-header-cache (now uses Sleepycat DB for faster access to very huge Maildirs).
• The new maildir-header-cache-patch makes it necessary to use recent autotools, so update USE_AUTOMAKE_VER and USE_AUTOCONF_VER.
• Rename internal variables and fix trailing whitespaces (portlint).
• Bump PORTREVISION

PR: ports/67872
Submitted by: maintainer