Bug#330800: gij-4.0: doesn't remove /var/lib/gcj-4.0/classmap.db

[Lars Wirzenius <liw@iki.fi>]

Package: gij-4.0
Version: 4.0.1-2

gij-4.0's postinst script creates /var/lib/gcj-4.0/classmap.db, but the
prerm script does not remove it when the package is being removed,
leaving a bit of cruft on the filesystem.