perl-db-file: remove this package

The module DB_File (Berkeley DB wrapper) is a Perl core module.
Long time ago, its build as a core module was broken.
Since perl-cross-1.0.2, this issue is fixed.
So, this package which build DB_File as CPAN module, becomes useless.

Signed-off-by: Francois Perrad <francois.perrad@gadz.org>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>