Update spamassassin to 3.4.1.

Changes:

• improved automation to help combat spammers that are abusing new top level domains;
• tweaks to the SPF support to block more spoofed emails;
• increased character set normalization to make rules easier to develop and stop spammers from using alternate character sets to bypass tests;
• continued refinement to the native IPv6 support; and
• improved Bayesian classification with better debugging and attachment hashing.

Full ChangeLog at https://metacpan.org/changes/distribution/Mail-SpamAssassin

The japanese/spamassassin port is broken until it's updated for 3.4.1.