Log Message:
Update spamassassin to 3.4.2.

From Attila Fueloep in pull request NetBSD/pkgsrc#32.

Apache SpamAssassin 3.4.2 contains numerous tweaks and bug fixes over the
past three and 1/2 years.  As we release 3.4.2, we are preparing 4.0.0 which
will move us into a full UTF-8 environment.  We expect one final 3.4.3
release.

As with any release there are a number of functional patches, improvements as
well as security reasons to upgrade to 3.4.2.  In this case we have over 3
years of issues being resolved at once.  And we are laying thr groundwork for
version 4.0 which is is designed to more natively handle UTF-8.

However, there is one specific pressing reason to upgrade.  Specifically, we
will stop producing SHA-1 signatures for rule updates.  This means that while
we produce rule updates with the focus on them working for any release from
v3.3.2 forward, they will start failing SHA-1 validation for sa-update.

*** If you do not update to 3.4.2, you will be stuck at the last ruleset
    with SHA-1 signatures in the near future. ***

Full release notes at \ 
http://svn.apache.org/repos/asf/spamassassin/branches/3.4/build/announcements/3.4.2.txt.