Remove db45.
This happens before EXPIRATION_DATE as no dependencies are left in ports,
the few that were there use db46+.
Approved by: Gea-Suan Lin (maintainer)
Apply two vendor fixes:
* patch.4.5.20.1: -----------------------------------------------------------
Fixes access to sequences in the Java API in DB 4.5.20.
* patch.4.5.20.2: -----------------------------------------------------------
Fixes a problem introduced in 4.5.20 when we changed the way DBTs are copied
in calls from the Java API into the core API.