Log Message:
Update spamprobe to 1.2a.

SpamProbe changes:
 - New email parsing implementation
 - New hash database, in addition to Berkeley DB (bdb/db4)
   (=> Hopefully no more "caught runtime exception: get: DB_PAGE_NOTFOUND:
       Requested page not found" on Linux every other day!)
 - And much more, check the ChangeLog for accurate information

pkgsrc changes:
 - Added db4 database backend to be optional (not requirement anymore)

Patches sent by the maintainer Ossi Herrala <oherrala@ee.oulu.fi>
in private mail.