Updating databases/p5-DBIx-DBSchema from 0.38nb1 to 0.39

Upstream changes:
0.39 Fri Mar 26 20:24:58 PDT 2010
        - mysql: TEXT->LONGTEXT
        - mysql: when reverse engineering, transform a default of
          CURRENT_TIMESTAMP into the more common NOW()
        - mysql: fix reverse-engineering of empty string default

(sno)