mail-filter/spamassassin: new revision to fix the systemd service.

mail-filter/spamassassin: new revision to fix the systemd service.

As part of bug 590346, I accidentally broke the systemd service file
by starting the service as spamd:spamd when it needs to bind to port
783. Even when the service is run in the foreground, it needs to be
started as root; it will then drop privileges if given the --username
and --groupname flags. The new service file gets this right, with
root owning the main process and spamd:spamd the children.

Thanks to Dan Goodliffe for the report and help debugging the issue.

Gentoo-Bug: 590346

Package-Manager: Portage-2.3.6, Repoman-2.3.1