Perl seems to have settled on the 'parent' module instead of manually defining
variables that tell the interpreter which packages to fall back to. Some
classes now use parent, some still use the old way.
Migrate everything over to be consistent.
This can be used as a run-time check later to ensure that kdesrc-build
finds compatible versions of its component modules (though that isn't
done yet).
Michael Pyne
David Faure