to trigger/signal a rebuild for the transition 5.8.8 -> 5.10.0.
The list of packages is computed by finding all packages which end
up having either of PERL5_USE_PACKLIST, BUILDLINK_API_DEPENDS.perl,
or PERL5_PACKLIST defined in their make setup (tested via
"make show-vars VARNAMES=...").
This module provides a wrapper for the DB_File module, adding locking.
When you need locking, simply use this module in place of DB_File and
add an extra argument onto the tie command specifying if the file should
be locked for reading or writing.
