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 implements the C3 algorithm. I have broken this out
into it's own module because I found myself copying and pasting
it way too often for various needs. Most of the uses I have for
C3 revolve around class building and metamodels, but it could
also be used for things like dependency resolution as well since
it tends to do such a nice job of preserving local precendence
orderings.